What is preload?

What is preload? mcq given below:

Q. What is preload?

(a) pressure in the ventricle at the end of systole
(b) pressure in the ventricle at the end of diastole
(c) Pressure in the aorta at the end of systole
(d) pressure in the atria at the end of systole

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Ans: (b) pressure in the ventricle at the end of diastole

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