Lecture 16: The Heart as a Pump (Hayward) Flashcards Preview

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Flashcards in Lecture 16: The Heart as a Pump (Hayward) Deck (11):
1

stroke volume

volume of blood pumped from one ventricle of the heart with each beat. Amt of blood that leaves ventricle from when aortic valve opens to closes

2

Frank Starling Mechanism

states that the stroke volume of the heart increases in response to an increase in the volume of blood filling the heart (the end diastolic volume) when all other factors remain constant.

3

amount of LV filling is a fx of:

how much volume started in LV and the time for filling before AV valves close

4

preload is a ______, while afterload is a ______

volume; pressure

5

3 factors that affect cardiac performance **

preload (diastolic filling), afterload (aortic pressure), inotropic state (contractility)

6

increased afterload --> stroke volume, cardiac output

decreases both

7

increased contractiliy --> cardiac performance

increases

8

Key modulators of cardiac output

Contractility, preload, afterload

9

increased contractility ---> stroke volume

increases

10

increased preload --> stroke volume, cardiac output

increases both

11

increased HR --> cardiac output

increases

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