Question

Which of the following events does not occur during ventricular systole?
A)Closure of AV valves. B)Opening of semilunar valves C)Relaxation of atria D)Second heart sound​

Answer 1

Events which do not occur in ventricular systole are -

B)Opening of semilunar valves

D)Second heart sound

Heart is the organ that pumps blood. The process is divided into four phases categorized into cardiac cycle.

The contraction of heart is referred to as systole while relaxation is referred to as diastole.

The phases in cardiac cycle are namely, articular systole, ventricular systole and cardiac diastole.

There are two sounds made by healthy heart namely lubb and dubb.

Former sound is produced in ventricular contraction while latter sound is produced during ventricular diastole.

Answer 2

It do not produce second heart sound

Explanation:

There is a whole complete cardiac cycle starts in which systole means contraction and diastole means relaxation.

Starting of the cycle begins by

late diastole - both sets of chamber relaxed . passive ventricular filling .

Than artrial systole takes place-in which atrial contraction forces a small amount of additional blood into ventricles .The maximum amount of blood in ventricles occurs at the end of ventricular relaxation. i.e end diastolic volume =135mL.First phase of ventricular contraction pushes AV valves closed but does not create but does not create enough pressure to open semulinar valve.as ventricular pressure rises and exceeds pressure in the atreries , the semilunar valves open and blood is ejected.