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MIDTERMS - HISTO LAB > Blood and Lymphatic Vessels > Flashcards

Blood and Lymphatic Vessels Flashcards

1
Q

circulatory system is divided into two components:

A
  • blood vascular system
  • lymphatic vascular system
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2
Q

system that transports blood

A

blood vascular system

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3
Q

system that collects and returns excess extracellular fluid (lymph) to the blood vascular system

A

lymphatic vascular system

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4
Q

The endothelium, which is the inner surface of blood vessels and lymphatic vessels are lined by flattened endothelial cells (_____).

A

Endotheliocytes

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5
Q

The fibrous elements in the intima and adventitia (mainly collagen) run ____ (along the length of the vessel)

A

longitudinally

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6
Q

The fibrous elements in the media (elastic tissue or muscle) run

A

Circularly

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7
Q

Elastic fibers, including those of the internal and external elastic laminae are often in the form of

A

fenestrated sheets

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8
Q

innermost coat of the wall of artery which is thin and appear scalloped or corrugated in the specimen.

A

Tunica intima

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9
Q

Tunica intima consists of:

A
  • endothelium
  • subendothelial layer of collagenous connective tissue
  • internal elastic lamina
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10
Q

Thin wavy band of elastic fibers which separates the tunica intima from the next layer in medium-sized and large arteries

A

Internal elastic lamina

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11
Q

The middle, thickest and most prominent coat of the artery

A

Tunica media

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12
Q

consists predominantly of smooth muscles arranged in concentric layers, elastic fibers scattered between the muscle cells, and a well-defined external elastic lamina separating it from the outermost tunic

A

tunica media

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13
Q

this is the thinner outermost coat of composed principally of areolar connective tissue

A

tunica adventitia

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14
Q

tunica adventitia is composed principally of areolar connective tissue (primarily ____ & ____)

A
  • type 1 collagen
  • elastic connective tissue fibers
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15
Q

Small blood vessels called _____ & nerves may be found in this layer (what layer?____) which also penetrate the outer half of the tunica media

A

Vasa vasorum; tunica adventitia

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16
Q

are the largest of the arteries.

A

Elastic Arteries

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17
Q

Because they arise directly from the heart, they are subject to cyclic changes of blood pressure.

A

Elastic Arteries

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18
Q
  • to adapt to the changes in blood pressure, an abundance of ____ are located in the walls of these vessels
  • to provide structural stability and allow distention of the elastic arteries
  • they also help in the maintenance of blood pressure in between heartbeats.
A

elastic fibers

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19
Q

____ constitute most of the arteries of the body

A

Muscular arteries

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20
Q

Muscular Arteries: _____ possess well-developed internal elastic laminae.

A

tunica intimae

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21
Q

Muscular Arteries: _____ is composed of many layers of smooth muscle cells, and its outer boundary in larger muscular arteries has an external elastic lamina.

A

tunica media

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22
Q

Muscular Arteries: _____ is also well supplied by vasa vasorum and nerve fibers

A

Tunica adventitia

23
Q

These are the smallest arteries and are responsible for regulating blood pressure.

A

Arterioles

24
Q

Arterioles: ______ is composed of an endothelium with a slight amount of subendothelial connective tissue.

A

Tunica intima

25
Q

Arterioles: ______ is made up of a few layers of smooth muscle cells, but in small arterioles, only a single smooth muscle cell layer is found.

A

Tunica media

26
Q

Arterioles: ______ is also slight with occasional fibroblasts

A

Tunica adventitia

27
Q

Tunica mediais made up of a few layers of smooth muscle cells, but in small arterioles, only a ______ is found.

A

single smooth muscle cell layer

28
Q

are very small vessels that consist of a single layer of endothelial cells surrounded by a basal lamina and occasional pericytes.

A

Capillaries

29
Q

These vessels exhibit selective permeability, and they, together with venules, are responsible for the exchange of gases, metabolites, and other substances between the blood stream and tissues of the body.

A

capillaries

30
Q

capillaries exhibit selective permeability, and they, together with ____are responsible for the exchange of gases, metabolites, and other substances between the blood stream and tissues of the body.

A

Venules

31
Q

three (3) types of capillaries:

A
  • continuous
  • fenestrated
  • sinusoidal
32
Q

_____ lack fenestrate and possess a continuous basal lamina.

A

Continuous capillaries

33
Q

Continuous capillaries are present in regions such as

A
  • skeletal muscle
  • lungs
  • thymus
  • peripheral nerve fibers
34
Q

_____ are penetrated by relatively large diaphragm-covered pores. These cells are also enveloped by a continuous basal lamina.

A

Fenestrated capillaries

35
Q

Fenestrated capillaries are located ______

A
  • endocrine glands
  • pancreas
  • lamina propria of the intestines
36
Q

They constitute the glomeruli of the kidneys

A

Fenestrated capillaries

37
Q

They are enveloped by a discontinuous basal lamina

A

Sinusoidal capillaries

38
Q

The intercellular junctions of their endothelial cells display gaps, permitting leakage of material into and out of these vessels.

A

Sinusoidal capillaries

39
Q

Sinusoidal capillaries are located in the

A
  • bone marrow
  • liver
  • lymph nodes
40
Q

____ are low-pressure vessels, that conduct blood from the larger tissues of the body to the heart.

A

Veins

41
Q

Also, many veins contain ______ in the lumen that prevent back flow of blood

A

valves

42
Q

Veins contain at least twice the amount of blood compared to arteries. This is because the lumina of veins are much _____ arteries

A

larger than

43
Q

These are the smallest veins into which capillaries drain. They are 20-3o um in diameter

A

Venules

44
Q

Flattened or branching cells called ____ may be seen outside the basal laminae of small venules, while some muscle may be present in larger vessels.

A

Pericytes

45
Q

Functionally, venules have to be distinguished from true veins. The ______ have considerable permeability and exchanges between blood and surrounding tissues can take place through them.

A

walls of venules

46
Q

are sites where lymphocytes and other cells pass out of (or into) the blood stream

A

venules

47
Q

compared to arteries, veins have

A
  • thinner walls
  • larger diameter
  • wider lumen
48
Q

___ are thin walled structures accompanied by a valve which carry lymph and are lined by endothelial cells, consequently the layer is composed of a thin smooth muscles

A

Lymphatic vessels

49
Q

The critical role of the valve lies by preventing the back flow of lymph allowing the system to function even without a _____

A

central pump.

50
Q

____ is the blood vessel with a relatively thick tunica media showing a prominent muscle content

A

Arteriole

51
Q

____ is the blood vessel with a wide lumen and thin wall; latter seems to be composed only of the lining endothelium and a thin surrounding areolar connective tissue

A

Venule

52
Q

____ is the thinnest walled blood vessel, the wall of which is just the lining endothelium; both tunica media and tunica adventitia have disappeared

A

Capillary

53
Q

In stained specimen, contents of a lymph vessel appear as a fibrinous mass with very few cells, mostly _____

A

Lymphocytes

MIDTERMS - HISTO LAB (7 decks)

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