Question

define cardiac cycle in brief. class 10 ch1 ​

Answer 1

${\mathfrak{\pink{\underline{\underline{Answer:-}}}}}$

The cardiac cycle is the sequence of events in one heartbeat.

It can be divided into three stages:

${\bf{\red{\underline{1).\;Diastole:-}}}}$ The chambers of the heart (atria and ventricles) are relaxed and felling up with blood from veins. The atrioventricular valves (pulmonary and aortic) are closed. This stage lasts for about 0.4 second.

${\bf{\red{\underline{1).\;Atrial\;systole:-}}}}$ The atria contract and top up the ventricles. This takes about 0.1 second.

${\bf{\red{\underline{1).\;Ventricular\;systole:-}}}}$ The ventricles contract and pump blood out of the heart into the arteries. During this stage the atrioventricular valves are closed and the semilunar valves are open. This takes about 0.3 second.

The total cycle takes about 0.8 second while the subject is resting. This gives a heart rate of about 75 beats per minute.

Answer 2

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Your's Answer...

The cardiac cycle is the performance of the human heart from the ending of one heartbeat to the beginning of the next. It consists of two periods: one during which the heart muscle relaxes and refills with blood, called diastole, followed by a period of robust contraction and pumping of blood, dubbed systole.

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