Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

HISTOLOGY - 1st Year 1st Sem Comprehensive Exam > Chapter 13 (CARDIOVASCULAR SYSTEM) - Histoworld > Flashcards

Chapter 13 (CARDIOVASCULAR SYSTEM) - Histoworld Flashcards

1
Q

Which layer of the heart is composed of cardiac muscle?

a. Epicardium
b. Pericardium
c. Myocardium
d. Endocardium
e. Endomysium

A

c. Myocardium
* The heart consists of three layers: epicardium, myocardium and endocardium. The epicardium is the outer layer of the heart, containing the blood vessels and nerves which supply the heart. The myocardium is the muscular layer of the heart. The endocardium is the inner layer of the heart. The innermost portion of the endocardium is composed of endothelium, a simple squamous epithelium. The pericardium is the connective tissue sac that the heart sits in. Endomysium is the connective tissue covering of an individual muscle cell.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Where is the myocardium the thickest?

a. Right atria
b. Left atria
c. Right ventricle
d. Left ventricle
e. Both right and left ventricle

A

d. Left ventricle
* The myocardium is the middle layer of the heart. It is thickest in the left ventricle, since the left ventricle is responsible for pumping blood throughout the systemic circulation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the connective tissue sac surrounding the heart?

a. Epicardium
b. Pericardium
c. Myocardium
d. Endocardium
e. Endomysium

A

b. Pericardium
* The heart consists of three layers: epicardium, myocardium and endocardium. The epicardium is the outer layer of the heart, containing the blood vessels and nerves which supply the heart. The myocardium is the muscular layer of the heart. The endocardium is the inner layer of the heart. The innermost portion of the endocardium is composed of endothelium, a simple squamous epithelium. The pericardium is the connective tissue sac that the heart sits in. Endomysium is the connective tissue covering of an individual muscle cell.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the connective tissue called which surrounds an individual cardiac muscle fiber?

a. Epicardium
b. Pericardium
c. Myocardium
d. Endocardium
e. Endomysium

A

e. Endomysium
* The heart consists of three layers: epicardium, myocardium and endocardium. The epicardium is the outer layer of the heart, containing the blood vessels and nerves which supply the heart. The myocardium is the muscular layer of the heart.The endocardium is the inner layer of the heart. The innermost portion of the endocardium is composed of endothelium, a simple squamous epithelium. The pericardium is the connective tissue sac that the heart sits in. Endomysium is the connective tissue covering of an individual muscle cell.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the pacemaker of the heart?

a. Sinoatrial node
b. Atrioventricular node
c. Bundle of His
d. Right bundle branch
e. Purkinje fiber

A

a. Sinoatrial node
* A cardiac impulse is transmitted through a specific pathway of modified cardiac tissue within the heart. The pacemaker of the heart is the sinoatrial node (SA node). The impulse then goes to the AV node. It goes through the ventricles via the bundle of His. The bundle of His is also called the atrioventricular bundle. This divides into right and left bundle branches. From there the impulse is transmitted into Purkinje fibers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Which of the following is not true regarding the endocardium?

a. The endocardium contains abundant adipose tissue
b. The endocardium is layered
c. The endocardium contains blood vessels
d. The endocardium contains smooth muscle
e. The endocardium is lined by endothelium

A

a. The endocardium contains abundant adipose tissue
* The epicardium contains abundant adipose tissue, not the endocardium. The endocardium is the inner layer of the heart. The layers of the heart being: endocardium, myocardium, and epicardium. The endocardium itself is layered. The innermost layer of the endocardium is lined by endothelium. The middle layer of the endocardium is connective tissue and smooth muscle. The outer layer of the endocardium is the subendocardial layer. The endocardium contains blood vessels.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the atrioventricular bundle?

a. Sinoatrial node
b. Atrioventricular node
c. Bundle of His
d. Right bundle branch
e. Purkinje fiber

A

c. Bundle of His
* A cardiac impulse is transmitted through a specific pathway of modified cardiac tissue within the heart. The pacemaker of the heart is the sinoatrial node (SA node). The impulse then goes to the AV node. It goes through the ventricles via the bundle of His. The bundle of His is also called the atrioventricular bundle. This divides into right and left bundle branches. From there the impulse is transmitted into Purkinje fibers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Where is endothelium located?

a. Epicardium
b. Pericardium
c. Myocardium
d. Endocardium
e. Endomysium

A

d. Endocardium

  • The heart consists of three layers: epicardium, myocardium and endocardium. The epicardium is the outer layer of the heart, containing the blood vessels and nerves which supply the heart. The myocardium is the muscular layer of the heart.The endocardium is the inner layer of the heart. The innermost portion of the endocardium is composed of endothelium, a simple squamous epithelium.
    The pericardium is the connective tissue sac that the heart sits in. Endomysium is the connective tissue covering of an individual muscle cell.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

“Pulling on heartstrings” refers to strong feelings of love or sympathy pulling one’s conscience. What anatomical structure is it a reference to?

a. Sinoatrial node
b. Bundle of His
c. Right bundle branch
d. Purkinje fiber
e. Chordae tendinae

A

e. Chordae tendinae
* The chordae tendinae are threadlike structures between the papillary muscles to the valves of the heart. A cardiac impulse is transmitted through a specific pathway of modified cardiac tissue within the heart. The pacemaker of the heart is the sinoatrial node (SA node). The impulse then goes to the AV node. It goes through the ventricles via the bundle of His. The bundle of His is also called the atrioventricular bundle. This divides into right and left bundle branches. From there the impulse is transmitted into Purkinje fibers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Where are the blood vessels which supply the heart located?

a. Epicardium
b. Pericardium
c. Myocardium
d. Endocardium
e. Endomysium

A

a. Epicardium
* The heart consists of three layers: epicardium, myocardium and endocardium. The epicardium is the outer layer of the heart, containing the blood vessels and nerves which supply the heart. The myocardium is the muscular layer of the heart. The endocardium is the inner layer of the heart. The innermost portion of the endocardium is composed of endothelium, a simple squamous epithelium. The pericardium is the connective tissue sac that the heart sits in. Endomysium is the connective tissue covering of an individual muscle cell.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

At what level of the vascular tree does gas exchange occur?

a. Capillary
b. Arteriole
c. Venule
d. Elastic artery
e. Muscular artery

A

a. Capillary
* Capillaries are very thin walled in order to easily allow the exchange of gases. Gaseous exchange between the blood and tissues occurs at the level of the capillaries. Arterioles are small branches of arteries with only one or two layers of smooth muscle in the tunica media. Arterioles regulate the amount of blood going into the capillary bed. Venules are small branches of veins. Elastic arteries are the arteries leaving the heart and the major branches. The aorta is an elastic artery. Most of the named arteries are muscular arteries (with the exception of the aorta and the major branches off the aorta). The dividing line between elastic arteries and muscular arteries is not clear cut. However, a pronounced internal elastic membrane and external elastic membrane are distinguishing characteristics of muscular arteries.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Which layer in an artery is primarily skeletal muscle?

a. Tunica intima
b. Tunica media
c. Tunica externa
d. All of the above
e. None of the above

A

e. None of the above
* The tunica intima is the innermost layer of a blood vessel. It is lined by endothelium. The tunica media is the middle layer of a blood vessel. The tunica media is primarily smooth muscle. The tunica externa or tunica adventitia is the outer layer of a blood vessel. In large vessels, the tunica adventitia contains vasa vasorum (blood vessels) and nervi vascularis (nerves).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Which of the following is NOT a distinguishing feature between larger veins and arteries?

a. Veins have valves whereas arteries do not have valves
b. The tunics in veins are not as clearly delimited as are the tunics in arteries
c. The walls in veins are thinner than the walls in arteries
d. The lumen of a vein is smaller than the lumen of an artery
e. None. All of the above are true

A

d. The lumen of a vein is smaller than the lumen of an artery
* Veins have valves whereas arteries do not have valves. The tunics in veins are not as clearly delimited as are the tunics in arteries. The walls in veins are thinner than the walls in arteries. The lumen of a vein is larger than the lumen of an artery.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

In which structure are things moved across the epithelium via pinocytotic vesicles?

a. Continuous capillaries
b. Fenestrated capillaries
c. Sinusoidal capillaries
d. AV anastomoses
e. Venous sinus

A

a. Continuous capillaries
* A characteristic of continuous capillaries is that things are transported across the epithelium via pinocytotic vesicles. A characteristic of fenestrated capillaries is the presence of pores or fenestrae. Sinusoidal capillaries (sinusoids) are wide leaky capillaries. They are found in the liver, spleen, and bone marrow. An arteriovenous anastomoses (AV anastomoses or AV shunt) is a direct route between arteries and veins. It bypasses the capillary bed. A venous sinus is a venous space lined by endothelium. A venous sinus surrounding the brain exists which is called the dural sinus.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is a thoroughfare which is a an intermediate between an arteriole and capillary?

a. Metcapillary
b. Metartery
c. Metvenule
d. Metarteriole
e. None of the above

A

d. Metarteriole
* A metarteriole is a thoroughfare that can be considered an intermediate between an arteriole and capillary is a metarteriole.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Which layer in an artery contains the endothelium?

a. Tunica intima
b. Tunica media
c. Tunica externa
d. All of the above
e. None of the above

A

a. Tunica intima
* The tunica intima is the innermost layer of a blood vessel. It is lined by endothelium. The tunica media is the middle layer of a blood vessel. The tunica media is primarily smooth muscle. The tunica externa or tunica adventitia is the outer layer of a blood vessel. In large vessels, the tunica adventitia contains vasa vasorum (blood vessels) and nervi vascularis (nerves).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What do you call the simple squamous epithelium that lines the blood vessels?

a. Epithelioid tissue
b. Mesothelium
c. Endothelium
d. Transitional
e. Pseudostratified

A

c. Endothelium
* Epithelial tissue has cells that are very tightly packed together. There is always a free surface associated with epithelial tissue. If a tissue is composed of a conglomeration of cells in tightly packed together, but it does not have a free surface, the tissue is called epithelioid tissue. An example of epithelioid tissue is the parenchyma of the adrenal gland. Mesothelium is simple squamous epithelium that lines the abdominal cavity, the pericardial cavity, and the thoracic cavity. Endothelium is simple squamous epithelium that lines the vascular system. Transitional epithelium is seen in the urinary tract. Transitional epithelium has dome shaped cells on the apical surface. Pseudostratified epithelium is a type of epithelium that has cells which all touch the basement membrane. Pseudostratified epithelium is only one cell layer thick. Pseudostratified epithelium appears stratified, but it is not really stratified.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

In which of the following is a portal system NOT found?

a. Kidney
b. Liver
c. Muscle
d. Brain
e. None of the above is correct; a portal system is found in all of the above

A

c. Muscle

  • The normal flow of blood is as follows: artery - arteriole - capillary - post capillary venule -vein. However, exceptions to this pattern of blood flow exist. The phenomenon when a vein is between two capillary beds is called a venous portal system. An example of this is the hepatic portal system. Another example of a venous portal system is seen in the brain between the hypothalamus and pituitary.
    The phenomenon when an arteriole is between two capillary beds is called an arterial portal system. This is seen in the kidney.
19
Q

What is the brachial artery?

a. Capillary
b. Arteriole
c. Venule
d. Elastic artery
e. Muscular artery

A

e. Muscular artery
* Capillaries are very thin walled in order to easily allow the exchange of gases. Gaseous exchange between the blood and tissues occurs at the level of the capillaries. Arterioles are small branches of arteries with only one or two layers of smooth muscle in the tunica media. Arterioles regulate the amount of blood going into the capillary bed. Venules are small branches of veins. Elastic arteries are the arteries leaving the heart and the major branches. The aorta is an elastic artery. Most of the named arteries are muscular arteries (with the exception of the aorta and the major branches off the aorta). The dividing line between elastic arteries and muscular arteries is not clear cut. However, a pronounced internal elastic membrane and external elastic membrane are distinguishing characteristics of muscular arteries.

20
Q

Which of the following is a distinct structure found specifically in the liver, spleen, and bone marrow?

a. Continuous capillaries
b. Fenestrated capillaries
c. Sinusoidal capillaries
d. AV anastomoses
e. Venous sinus

A

c. Sinusoidal capillaries

  • A characteristic of continuous capillaries is that things are transported across the epithelium via pinocytotic vesicles. A characteristic of fenestrated capillaries is the presence of pores or fenestrae. Sinusoidal capillaries (sinusoids) are wide leaky capillaries. They are found in the liver, spleen, and bone marrow. An arteriovenous anastomoses (AV anastomoses or AV shunt) is a direct route between arteries and veins. It bypasses the capillary bed.
    A venous sinus is a venous space lined by endothelium. A venous sinus surrounding the brain exists which is called the dural sinus.
21
Q

Which layer in an artery is primarily smooth muscle?

a. Tunica intima
b. Tunica media
c. Tunica externa
d. All of the above
e. None of the above

A

b. Tunica media
* The tunica intima is the innermost layer of a blood vessel. It is lined by endothelium. The tunica media is the middle layer of a blood vessel. The tunica media is primarily smooth muscle. The tunica externa or tunica adventitia is the outer layer of a blood vessel. In large vessels, the tunica adventitia contains vasa vasorum (blood vessels) and nervi vascularis (nerves).

22
Q

A pronounced internal elastic membrane and external elastic membrane are distinguishing characteristics of which type of vessel?

a. Capillary
b. Arteriole
c. Venule
d. Elastic artery
e. Muscular artery

A

e. Muscular artery
* Capillaries are very thin walled in order to easily allow the exchange of gases. Gaseous exchange between the blood and tissues occurs at the level of the capillaries. Arterioles are small branches of arteries with only one or two layers of smooth muscle in the tunica media. Arterioles regulate the amount of blood going into the capillary bed. Venules are small branches of veins. Elastic arteries are the arteries leaving the heart and the major branches. The aorta is an elastic artery. Most of the named arteries are muscular arteries (with the exception of the aorta and the major branches off the aorta). The dividing line between elastic arteries and muscular arteries is not clear cut. However, a pronounced internal elastic membrane and external elastic membrane are distinguishing characteristics of muscular arteries.

23
Q

Which of the following constitutes the microvascular bed of a tissue?

a. Capillaries
b. Capillaries and arterioles
c. Capillaries, arterioles, and post capillary venules
d. Capillaries, arterioles, post capillary venules, and veins
e. Capillaries, arterioles, post capillary venules, veins, and arteries

A

c. Capillaries, arterioles, and post capillary venules

* Capillaries, arterioles, and post capillary venules make up the microvascular bed of a tissue.

24
Q

What are wide, leaky capillaries called?

a. Continuous capillaries
b. Fenestrated capillaries
c. Sinusoidal capillaries
d. AV anastomoses
e. Venous sinus

A

c. Sinusoidal capillaries
* A characteristic of continuous capillaries is that things are transported across the epithelium via pinocytotic vesicles. A characteristic of fenestrated capillaries is the presence of pores or fenestrae. Sinusoidal capillaries (sinusoids) are wide leaky capillaries. They are found in the liver, spleen, and bone marrow. An arteriovenous anastomoses (AV anastomoses or AV shunt) is a direct route between arteries and veins. It bypasses the capillary bed. A venous sinus is a venous space lined by endothelium. A venous sinus surrounding the brain exists which is called the dural sinus.

25
Q

What is a direct route between arteries and veins called?

a. Continuous capillaries
b. Fenestrated capillaries
c. Sinusoidal capillaries
d. AV anastomoses
e. Venous sinus

A

d. AV anastomoses

  • A characteristic of continuous capillaries is that things are transported across the epithelium via pinocytotic vesicles. A characteristic of fenestrated capillaries is the presence of pores or fenestrae. Sinusoidal capillaries (sinusoids) are wide leaky capillaries. They are found in the liver, spleen, and bone marrow.
    An arteriovenous anastomoses (AV anastomoses or AV shunt) is a direct route between arteries and veins. It bypasses the capillary bed.
    A venous sinus is a venous space lined by endothelium. A venous sinus surrounding the brain exists which is called the dural sinus.
26
Q

Which layer in an elastic artery is the largest thickest?

a. Tunica intima
b. Tunica albuginea
c. Tunica externa
d. Tunica vaculosa
e. Tunica media

A

e. Tunica media

* In an elastic artery, the tunica media is the thickest.

27
Q

In which of the following is an arterial portal system found?

a. Kidney
b. Liver
c. Muscle
d. Brain
e. Stomach

A

a. Kidney
* The normal flow of blood is as follows: artery - arteriole - capillary - post capillary venule -vein. However, exceptions to this pattern of blood flow exist. The phenomenon when a vein is between two capillary beds is called a venous portal system. An example of this is the hepatic portal system. Another example of a venous portal system is seen in the brain between the hypothalamus and pituitary. The phenomenon when an arteriole is between two capillary beds is called an arterial portal system. This is seen in the kidney.

28
Q

What are vasa vasorum?

a. Vasoactive material
b. Valves
c. Vasopressin secreting cells
d. Nerves
e. Blood vessels

A

e. Blood vessels

* Vasa vasorum are the blood vessels of the blood vessels. These are the vessels which supply the vessel wall.

29
Q

Which structure has only a few layers of muscle in the tunica media?

a. Capillary
b. Arteriole
c. Elastic artery
d. Muscular artery

A

b. Arteriole

* The tunica media is the middle layer of a blood vessel. The tunica media is primarily smooth muscle.

30
Q

Which layer in a large vessel contains the nervi vascularis?

a. Tunica intima
b. Tunica media
c. Tunica externa
d. All of the above
e. None of the above

A

c. Tunica externa
* The tunica intima is the innermost layer of a blood vessel. It is lined by endothelium. The tunica media is the middle layer of a blood vessel. The tunica media is primarily smooth muscle. The tunica externa or tunica adventitia is the outer layer of a blood vessel. In large vessels, the tunica adventitia contains vasa vasorum (blood vessels) and nervi vascularis (nerves).

31
Q

What vessel regulates the amount of blood going into a capillary bed?

a. Capillary
b. Arteriole
c. Venule
d. Elastic artery
e. Muscular artery

A

b. Arteriole

  • Capillaries are very thin walled in order to easily allow the exchange of gases. Gaseous exchange between the blood and tissues occurs at the level of the capillaries. Arterioles are small branches of arteries with only one or two layers of smooth muscle in the tunica media. Arterioles regulate the amount of blood going into the capillary bed.
    Venules are small branches of veins. Elastic arteries are the arteries leaving the heart and the major branches. The aorta is an elastic artery. Most of the named arteries are muscular arteries (with the exception of the aorta and the major branches off the aorta). The dividing line between elastic arteries and muscular arteries is not clear cut. However, a pronounced internal elastic membrane and external elastic membrane are distinguishing characteristics of muscular arteries.
  • Histology hint from Sarah Bellham: Elastic arteries also have an internal elastic membrane. However, there is so much elastic material in the tunica intima of an elastic artery, that a single, discrete internal elastic membrane is not visible.
32
Q

What is the aorta?

a. Capillary
b. Arteriole
c. Venule
d. Elastic artery
e. Muscular artery

A

d. Elastic artery
* Capillaries are very thin walled in order to easily allow the exchange of gases. Gaseous exchange between the blood and tissues occurs at the level of the capillaries. Arterioles are small branches of arteries with only one or two layers of smooth muscle in the tunica media. Arterioles regulate the amount of blood going into the capillary bed. Venules are small branches of veins. Elastic arteries are the arteries leaving the heart and the major branches. The aorta is an elastic artery. Most of the named arteries are muscular arteries (with the exception of the aorta and the major branches off the aorta). The dividing line between elastic arteries and muscular arteries is not clear cut. However, a pronounced internal elastic membrane and external elastic membrane are distinguishing characteristics of muscular arteries.

33
Q

What are most of the named arteries in the body?

a. Capillary
b. Arteriole
c. Venule
d. Elastic artery
e. Muscular artery

A

e. Muscular artery

  • Capillaries are very thin walled in order to easily allow the exchange of gases. Gaseous exchange between the blood and tissues occurs at the level of the capillaries.
    Arterioles are small branches of arteries with only one or two layers of smooth muscle in the tunica media. Arterioles regulate the amount of blood going into the capillary bed.
    Venules are small branches of veins.
    Elastic arteries are the arteries leaving the heart and the major branches. The aorta is an elastic artery.
    Most of the named arteries are muscular arteries (with the exception of the aorta and the major branches off the aorta). The dividing line between elastic arteries and muscular arteries is not clear cut. However, a pronounced internal elastic membrane and external elastic membrane are distinguishing characteristics of muscular arteries.
34
Q

Which structure contains pores?

a. Continuous capillaries
b. Fenestrated capillaries
c. Sinusoidal capillaries
d. AV anastomoses
e. Venous sinus

A

b. Fenestrates capillaries
* A characteristic of continuous capillaries is that things are transported across the epithelium via pinocytotic vesicles. A characteristic of fenestrated capillaries is the presence of pores or fenestrae. Sinusoidal capillaries (sinusoids) are wide leaky capillaries. They are found in the liver, spleen, and bone marrow. An arteriovenous anastomoses (AV anastomoses or AV shunt) is a direct route between arteries and veins. It bypasses the capillary bed. A venous sinus is a venous space lined by endothelium. A venous sinus surrounding the brain exists which is called the dural sinus.

35
Q

Which one of the following is a pluripotential cell that is prevalent around post capillary venules?

a. Fibroblast
b. Endothelial cell
c. Pericyte
d. Histiocyte
e. Macrophage

A

c. Pericyte

* A pericyte is a pluripotential cell that is prevalent around post capillary venules.

36
Q

Which layer in an artery is also called the tunica adventitia?

a. Tunica intima
b. Tunica media
c. Tunica externa
d. All of the above
e. None of the above

A

c. Tunica externa
* The tunica intima is the innermost layer of a blood vessel. It is lined by endothelium. The tunica media is the middle layer of a blood vessel. The tunica media is primarily smooth muscle. The tunica externa or tunica adventitia is the outer layer of a blood vessel. In large vessels, the tunica adventitia contains vasa vasorum (blood vessels) and nervi vascularis (nerves).

37
Q

Which layer in an artery is primarily connective tissue?

a. Tunica intima
b. Tunica media
c. Tunica externa
d. All of the above
e. None of the above

A

c. Tunica externa
* The tunica intima is the innermost layer of a blood vessel. It is lined by endothelium. The tunica media is the middle layer of a blood vessel. The tunica media is primarily smooth muscle. The tunica externa or tunica adventitia is the outer layer of a blood vessel. In large vessels, the tunica adventitia contains vasa vasorum (blood vessels) and nervi vascularis (nerves).

38
Q

What type of tissue lines blood vessels?

a. Simple squamous epithelium
b. Simple cuboidal epithelium
c. Simple columnar epithelium
d. Stratified squamous epithelium
e. Transitional epithelium

A

a. Simple squamous epithelium
* The lining of a blood vessel is simple squamous epithelium. This lining is called endothelium. Epithelium lines body cavities and surfaces. Simple squamous epithelium is “simple” because it is one cell thick. “Squamous” refers to the fact that the cells are flat.

39
Q

In which of the following is a venous portal system found?

a. Kidney
b. Liver
c. Muscle
d. Skin
e. Stomach

A

b. Liver
* The normal flow of blood is as follows: artery - arteriole - capillary - post capillary venule -vein. However, exceptions to this pattern of blood flow exist. The phenomenon when a vein is between two capillary beds is called a venous portal system. An example of this is the hepatic portal system. Another example of a venous portal system is seen in the brain between the hypothalamus and pituitary. The phenomenon when an arteriole is between two capillary beds is called an arterial portal system. This is seen in the kidney.

40
Q

What are nervi vascularis?

a. Neuropil
b. Neuroglia
c. Pigmented lesion of a vessel
d. Nerves
e. Blood vessels

A

d. Nerves

* Nervi vascularis are nerves of the blood vessels. These are the nerves which supply the vessel wall.

41
Q

Which structure receives blood from the capillary bed?

a. Capillary
b. Arteriole
c. Venule
d. Elastic artery
e. Muscular artery

A

c. Venule

  • Capillaries are very thin walled in order to easily allow the exchange of gases. Gaseous exchange between the blood and tissues occurs at the level of the capillaries.
    Arterioles are small branches of arteries with only one or two layers of smooth muscle in the tunica media. Arterioles regulate the amount of blood going into the capillary bed.
    Venules are small branches of veins.
    Elastic arteries are the arteries leaving the heart and the major branches. The aorta is an elastic artery.
    Most of the named arteries are muscular arteries (with the exception of the aorta and the major branches off the aorta). The dividing line between elastic arteries and muscular arteries is not clear cut. However, a pronounced internal elastic membrane and external elastic membrane are distinguishing characteristics of muscular arteries.
42
Q

Which layer in a large artery or vein contains the vasa vasorum?

a. Tunica intima
b. Tunica media
c. Tunica externa
d. All of the above
e. None of the above

A

c. Tunica externa

  • The tunica intima is the innermost layer of a blood vessel. It is lined by endothelium. The tunica media is the middle layer of a blood vessel. The tunica media is primarily smooth muscle.
    The tunica externa or tunica adventitia is the outer layer of a blood vessel. In large vessels, the tunica adventitia contains vasa vasorum (blood vessels) and nervi vascularis (nerves).
43
Q

What is the venous channel which is around the brain?

a. Continuous capillaries
b. Fenestrated capillaries
c. Sinusoidal capillaries
d. AV Anastomoses
e. Venous sinus

A

e. Venous sinus

* A characteristic of continuous capillaries is that things are transported across the epithelium via pinocytotic vesicles.
A characteristic of fenestrated capillaries is the presence of pores or fenestrae.
Sinusoidal capillaries (sinusoids) are wide leaky capillaries. They are found in the liver, spleen, and bone marrow.
An arteriovenous anastomoses (AV anastomoses or AV shunt) is a direct route between arteries and veins. It bypasses the capillary bed.
A venous sinus is a venous space lined by endothelium. A venous sinus surrounding the brain exists which is called the dural sinus.

HISTOLOGY - 1st Year 1st Sem Comprehensive Exam (22 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions