Question

rhythmic expansion and contraction of heart is called

Answer 1

The term which is used to explain the rhythmic contraction and relaxation of the heart is called as cardiac cycle.

• Contraction is denoted as cardiac systole.

• Further Relaxation is denoted as cardiac diastole.

- Contraction and relaxation are stated as the cardiac cycle.

-The heart beats 72 times per minute in an individual human body.

Answer 2

Contraction of heart is called systole and expansion of heart is called  cardiac diastole.  

Explanation:

• Heart is one of the most important organs of our body. It is the pumping organ in our circulatory system which pumps blood throughout our body through the blood vessels.

• Heart is a thick muscular structure which is hollow inside with four chambers, guarded from each other my septa and valves.

• As the auricles contract followed by ventricles, blood leaves the heart and is pushed to lungs as well as whole body, called systole.

• As the blood returns from the veins into heart, it relaxes with increase in volume, called diastole.  

Learn more about cardiac diastole:

What is cardiac cycle? Describe the events that occur during joint diastole and atrial systole

https://brainly.in/question/6645806

What would be the heart rate of a person if the cardiac output is 5L blood volume in the ventricles at the end of diastole is 100mL and at the end of ventricular systole is 50 mL

https://brainly.in/question/9667641