Question

The rhythmic expansion and contraction of the heart is called_______________________ . Fill in the blank.
Topic: Transportation in Animals Transportation

Answer 1

Dear Student,

◆ Answer -

The rhythmic expansion and contraction of the heart is called cardiac cycle.

● Explanation -

• Cardiac cycle is rhythmic expansion and contraction of the heart.
• Heart expands to receive blood from veins is called cardiac diastole.
• Heart contracts to pump the blood into arteries is called cardiac systole.

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Answer 2

Answer:

The rhythmic expansion and contraction of the heart is called cardiac cycle.  

Explanation:

The heart is a muscular organ that expands and contracts rhythmically. A normal healthy adult heart beats about seventy times in a minute. This periodic expansion and contraction enables the heart to pump in and out deoxygenated and oxygenated blood in the various arteries and veins.  

The contraction of the heart is called cardiac systole and the expansion is known as cardiac diastole. Both these movements together comprise the cardiac cycle. It is through the cardiac cycle that all parts of the body get oxygen.