Lecture 16: The Heart as a Pump (Hayward)

Question 1

stroke volume

Answer 1

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

Question 2

Frank Starling Mechanism

Answer 2

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.

Question 3

amount of LV filling is a fx of:

Answer 3

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

Question 4

preload is a ______, while afterload is a ______

Answer 4

volume; pressure

Question 5

3 factors that affect cardiac performance **

Answer 5

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

Question 6

increased afterload –> stroke volume, cardiac output

Answer 6

decreases both

Question 7

increased contractiliy –> cardiac performance

Answer 7

increases

Question 8

Key modulators of cardiac output

Answer 8

Contractility, preload, afterload

Question 9

increased contractility —> stroke volume

Answer 9

increases

Question 10

increased preload –> stroke volume, cardiac output

Answer 10

increases both

Question 11

increased HR –> cardiac output

Answer 11

increases