vascular distensibility and functions of arterial venous system ( ch 15) Flashcards Preview

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Flashcards in vascular distensibility and functions of arterial venous system ( ch 15) Deck (12):
1

Distensible

nature of arteries to allow them to accomodate with different pressures. Veins are 8 times more distensible than arteries

2

Vascular compliance

portion of blood that can be stored in a given portion of circulation for each mmHg pressure rise than to know the distensibilities of the individual vessels

3

Delayed compliance

when blood fills a vessels it takes a second for the vessel walls to "catch up"

4

average systolic pressure

120 mm Hg,

5

average diastolic pressure

80 mm Hg

6

pulse pressure

difference between systolic and diastolic pressures ( ~ 40mm Hg)

7

what affects pulse pressure?

stroke volume, compliance of arterial tree

8

aortic valve stenosis

diameter of aortic valve is reduced. Aortic pressure is reduced significantly

9

ductus arteriosus

1/2 of blood pumped into aorta flows backwards into pulmonary artery/ This allows diastolic pressure to fall.

10

aortic regurgitation

aortic valve is absent or doesnt work. So blood flows back into the left ventricle. Aortic pressure can fall all the way to zero between beats.

11

Transmission of pressure pulse

heart comes out of the left ventricle with a lot of inertia and doesnt really move anywhere. The pressure of the proximal aorta overcomes the inertia to move blood.

12

auscultatory method

involves applying pressure to an artery and listening to the different sounds ( called karotkoff sounds)