Cardiovascular System Flashcards
Consists of heart and a system of vessels for the distribution of blood to the tissues of the body and the lungs for exchange of gases
Cardiovascular System
carry blood away from the heart
Arteries
carry blood towards the heart
Veins
circulation to the lungs
Pulmonary circulation
circulation to the body
Systemic circulation
This system includes a powerful pump, the heart
Blood vascular system
Arteries branch into progressively smaller arteries until they form microscopic vessels called?
capillaries
Capillaries feed into small veins that join to form?
larger veins
Newly oxygenated blood returns through veins to the left side of the heart that pumps it to the rest of the body and heart via the?
aorta
removes wastes and bacteria from the interstitial fluid and returns protein-rich fluid to the bloodstream
Lymphatic system
Cone-shaped, hollow muscular structure
Heart
is directed dorsad or cranio-dorsad and is attached to other
thoracic structures by large arteries, veins and the pericardial sac
base
is directed ventrad and is entirely free within the pericardial sac
apex
In the ?, the right side of the heart is on the right side of the body but oriented more cranial than the left side, which is left and somewhat caudad
living animal
● Fibroserous sac enclosing the heart
● Composed of fibrous and serous, covered by mediastinal (pericardiac) pleura
pericardium
- atough, fibrous sac surrounding the serous pericardium, the heart and the pericardial cavity
- it is closed above by its attachment to the great vessels of the heart
Fibrous pericardium
connects the pericardium to the floor of the thorax
Sternopericardiac ligament
connects the pericardium to the diaphragm
Phrenicopericardiac ligament
- a serous membrane forming a closed cavity
- it covers the heart (visceral layer) and lines the inner surface of the fibrous pericardial sac (parietal layer)
Serous pericardium
lines the inner surface of the fibrous pericardium. It reflects onto the surface of the heart as the visceral layer
Parietal layer of the serous pericardium
- covers the myocardium of the heart closely
- it is also called the epicardium
Visceral layer of the serous pericardium
- A potential space between the visceral and parietal layers of serous pericardium
- It has approximately one ml of yellow fluid between the contacting layers, which acts as a lubricant to allow the heart freedom of movement during contraction
Pericardial cavity
the outer serous covering; thin layer of mesothelium covering the surface of the heart
Epicardium
the muscle layer making up the majority of the thickness of the heart wall; between the endocardium and epicardium
Myocardium
thin, mesothelial layer lining the atria and ventricles; continuous with the endothelium lining the great vessels entering and leaving the heart
Endocardium
low-pressure system
pulmonary circulation
high pressure systems
systemic circulation
receives blood by way of large veins
Atrium
pumps blood from the heart through a large artery
Ventricle
a pectinated muscular structure which forms a distinctive
pouch visible on the exterior of the heart and overlaps the pulmonary trunk
Auricle
the large vein returning blood from the head, neck and thoracic limbs to the right atrium
Cranial vena cava
the large vein returning blood from part of the thorax, the viscera and the caudal part of the body to the right atrium
Caudal vena cava
the chamber of the heart receiving deoxygenated
blood from the body
Right atrium
the chamber receiving blood from the right atrium and sending it to the lungs
Right ventricle
is the funnel shaped end of the right ventricle leading to the pulmonary trunk
conus
the large vessel carrying blood from the right ventricle to the pulmonary arteries, thus, to the lungs
Pulmonary trunk
the two branches of the pulmonary trunk carrying blood to the lungs; one to the right lung, one to the left
Pulmonary arteries
the numerous vessels emptying oxygenated blood from the lungs into the left atrium of the heart
Pulmonary veins
receives oxygenated blood from the lungs via the pulmonary veins
Left atrium
sends oxygenated blood to the body and heart
Left ventricle
the major outflow from the left ventricle into the systemic circulation
Aorta
between the atrium and the ventricle of each side
Atrioventricular valve (A-V valve)
left A-V valve, because in humans, it has two distinct flaps or cusps
Bicuspid valve
left A-V valve, because of its imagined resemblance to a bishop’s miter, or two-sided hat
Mitral valve
right A-V valve, because in humans it has three flaps or cusp
Tricuspid valve
strong, fibrous connections between the valve leaflets and the papillary muscles
Chordae tendineae
The chordae tendineae attach to small muscular protrusions called ? that project into the lumina of the ventricle
papillary muscle
- Ensures that blood flows only from the ventricle into the artery and not in the opposite direction
- Has three cuplike leaflets, with convex side facing the ventricle
Semilunar valve
lies at the junction of the left ventricle and aorta
Aortic valve
at the junction of the right ventricle and pulmonary trunk
Pulmonary valve
Resembles the branching of a tree in that the arteries start as large vessels and divide into smaller and smaller branches
Blood Vessels
The smallest arteries are?
arterioles
The smallest arteries are arterioles, which are continuous with the smallest blood vessels called?
capillaries
Capillaries unite to form ? that come together to form larger and larger veins
small venules
Arteries and Arterioles are lined with?
endothelium
● Tiny tubes composed almost entirely of endothelium, a continuation of
the simple squamous epithelium that lines the heart and blood vessels
● These thin-walled vessels are only large enough in diameter to
accommodate a single file of erythrocytes
● The wall acts as a selectively permeable membrane that permits water,
oxygen and nutrients to leave the blood for tissue cells and permits waste
products from tissue cells to enter the blood
Capillaries
are larger in diameter than the arteries they parallel and have much thinner walls
Veins
frequently is present where two or more veins unite to form a larger vein
valve
does not reenter the vascular space directly is recovered by thin-walled lymphatic vessels
extracellular fluid
Resemble veins in that they contain numerous valves permitting flow only toward the heart
Lymphatic Vessels
the fluid within the lymphatic vessels; are transported to larger and larger lymph vessels and finally emptied into the cranial vena cava or one of its tributaries
Lymph
two large lymph vessels draining the head and neck, usually terminate in the jugular veins
Tracheal trunks
- where lymph from the caudal half of the body is delivered
- traverses the thoracic cavity adjacent to the aorta to empty its lymph into the cranial vena cava
Thoracic duct
Part of the vascular system that circulates the blood through the lungs
Pulmonary Circulation
is delivered into the pulmonary system by contraction of the right ventricle
Deoxygenated blood
Each pulmonary artery subdivides into ? going to individual lobes of the lungs
lobar arteries
In Pulmonary Circulation as gases are exchanged, the color of the blood changes from the?
bluish maroon color of deoxygenated blood to the bright red of oxygenated blood
Refers to the movement of oxygenated blood to all areas of the body and the return of deoxygenated blood to the heart
Systemic Circulation
○ The largest artery
○ The left ventricle receives oxygenated blood from the left atrium and pumps the blood throughout the systemic circulation by way of the?
aorta
found at the junction of the left ventricle and aorta and prevents backflow of blood from the aorta into the left ventricle when the ventricle relaxes
Aortic valve