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Describe The Frank Starling Law In The Heart

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NAME___Vitaliy Navalyanyy____________________

1) What is stroke volume and how is it controlled by the heart? What other factors can affect stroke volume (extrinsic)?

Stroke volume is the volume of blood that is pumped by a cardiac ventricle. The blood pumps with each beat of the heart. Stroke volume can be affected by Intrinsic Control (by increasing venous return to the heart) and Extrinsic Control (due to sympathetic stimulation of the heart). Both of the controls increase the stroke volume by making the strength of heart contraction to go up.

2) What is the equation for Cardiac Output? If heart rate decreases what must happen to maintain cardiac output?

Cardiac Output = Heart Rate multiplied by Stroke volume. When heart rate slows down, it allows for more time for ventricles to fill. This increases EDV and stroke volume.

3) …show more content…
SV(stroke volume)*HR(heart rate)=CO(cardiac output)
*Stroke volume increases as EDV increases
*EDV is determined by venous return
The law defines the stretch of cardiac muscle cells. The more the cardiac muscle cells stretch, the more the contraction force will be
Starling Law discusses how the blood that enters into the heart or capillaries must be accounted for when it leaves. Blood that enters through superior vena cava must leave through the aorta without leaking. The slower the heart rate, the more time it needs to fill. When we exercise, there is more venous blood that comes back.

4) (4 pts)
Indicate the effect that an increase in the following factors would have on blood flow:
(Would the factor increase or decrease blood flow?)

Vessel length ¬¬¬__Resistance goes up; Blood flow goes

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