Question

Write the difference between systole and diastole.

Answer 1

Hint: The systole is a phase of the cardiac cycle during which the ventricle muscles of the heart contract after filling the blood. Diastole is the phase of the cardiac cycle during which the heart muscles are relaxed allowing the chambers to fill with blood.

Complete Answer:

Sl.No	Systole	Diastole
1.	The process of contraction of heart muscle during the cardiac cycle is called systole.	The process of relaxation of heart muscle during the cardiac cycle is called diastole.
2.	Blood is pumped out of the cardiac chambers.	Blood is filled in the cardiac chambers.
3.	To prevent backflow of blood, the valves remain closed.	To allow the entry of blood, the valves remain open.
4.	During systole, the blood pressure is increased inside the heart.	During diastole, the blood pressure is decreased inside the heart.
5.	The blood pressure of 120 mmHg is considered as normal during systole.	The blood pressure of 80 mmHg is considered as normal during diastole.
6.	The blood is pumped from the heart into the pulmonary artery through the aorta.	The blood is filled into the heart chambers from the pulmonary veins.

Note: Systole plays a vital role in determining the chances of having a stroke or heart attack. If the diastolic blood pressure is normal and systolic blood pressure is high then it results in a condition called Isolated Systolic Hypertension (ISH) and is risky as it has a high chance of causing heart attack.