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Drew 921 > Intro to CV > Flashcards

Intro to CV Flashcards

1
Q

How much blood resides in the venous system?

A

2/3

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2
Q

How much blood resides in the heart?

A

7%

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3
Q

How much blood resides in the pulmonary circulation?

A

10%

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4
Q

How much blood resides in the arteries?

A

13%

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5
Q

Define pericardium

A

avascular, fibrous sac surround heart

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6
Q

Function of the pericardium?

A

confines heart to position in mediastinum with sufficient freedom of movement while preventing over-stretching

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7
Q

Describe composition of the parietal pericardium.

A

aka fibrous pericardium

– touch, inelastic, fibrous CT of collagen + elastin

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8
Q

Where does the fibrous pericardium attach?

A

sternum, diaphragm, anterior mediastinum, great vessels

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9
Q

Describe composition of visceral pericardium?

A

single layer of mesothelial cells attached to the epicardium

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10
Q

Function of the visceral pericardium?

A 
Vagal reflexes (it is innervated)
secretion of prostanoids for cardiac reflexes & tone
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11
Q

Function of the serous fluid in the pericardial cavity? How much fluid?

A

reduce friction, 15-50mL

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12
Q

What is pericarditis?

A

inflammation of the pericardium with an increase in pericardial fluid, caused by infection, surgery, & trauma

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13
Q

What is cardiac tamponade?

A

the effusion of pericardial fluid such that the heart cannot stretch…decreased filling –> shock?

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14
Q

What are the 3 layers of the heart?

A

1) epicardium
2) myocardium
3) endocardium

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15
Q

composition of the epicardium

A

thin, transparent, delicate CT

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16
Q

composition of the myocardium

A

thickest layer consisting of cardiac myocytes

17
Q

composition of the endocardium

A

endothelial cells continuous with lining of the great vessels

18
Q

What is the bicuspid valve?

A

the mitral valve – left AV

19
Q

What is the function of chordae tendinae?

A

connect AV valves to papillary muscles to help withstand high pressure during contraction

20
Q

What valves are supported?

A

AV only

21
Q

What are the semilunar valves?

A

Aortic & pulmonary

22
Q

How much does the heart pump per minute?

A

5L (30*weight!)

Drew 921 (33 decks)

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