Question

writes notes on cardiac cycle............​

Answer 1

CARDIAC CYCLE :

• It is made up of a single event of the contraction and relaxation of the heart which is called the heartbeat.
• The contraction is called the systole and the relaxation is called the diastole.
• One cardiac cycle completes in 0.8 seconds. It has the following stages:

↗Atrial systole: The contraction of the right and left atria due to the activity of the SA

node results in forcing of the blood to the ventricles.

> The atrioventricular valves are

open during this stage.

>Initiation of ventricular systole: As the impulse passes to the AV Node from the SA

node, there is a delay of 0.09ms so that the ventricles are appropriately filled with

the blood.

> The ventricular systole then begins, and the atrioventricular valves are

closed.

> This closure produces the first sound of the heartbeat.

>Completion of ventricular systole: It is marked by the flow of blood to the

pulmonary artery and aorta by the right and left ventricle respectively.

> Initiation of ventricular diastole: The semilunar valves close during this stage and

the second heartbeat sound is made.

> Joint diastole: During this stage, the atria, as well as the ventricles, are relaxed. The

atrioventricular valves are open, and the semilunar valves remain closed.

Answer 2

Question ⤵

Write notes on Cardiac cycle.

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CARDIAC CYCLE:

• It is made up of a single event of the contraction and relaxation of the heart which is called the heartbeat.

• The contraction is called the systole and the relaxation is called the diastole.

One cardiac cycle completes in 0.8 seconds. It has the following stages:

↗Atrial systole: The contraction of the right and left atria due to the activity of the SA node results in forcing of the blood to the ventricles.

The atrioventricular valves are open during this stage.

Initiation of ventricular systole: As the impulse passes to the AV Node from the SA node, there is a delay of 0.09ms so that the ventricles are appropriately filled with the blood.

The ventricular systole then begins, and the atrioventricular valves are closed. This closure produces the first sound of the heartbeat.

Completion of ventricular systole : It is marked by the flow of blood to the pulmonary artery and aorta by the right and left ventricle respectively.

Initiation of ventricular diastole: The semilunar valves close during this stage and the second heartbeat sound is made.

Joint diastole: During this stage, the atria, as well as the ventricles, are relaxed. The atrioventricular valves are open, and the semilunar valves remain closed.

Thanks...