Question

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Define heart ​

Answer 1

Answer:

A hollow muscular organ that pumps the blood through the circulatory system by rhythmic contraction and dilation. In vertebrates there may be up to four chambers (as in humans), with two atria and two ventricles.

Explanation:

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Answer 2

Answer:

The human heart is a muscular organ having a size of our fist. It is made up of cardiac muscle. It is an organ that pumps blood throughout the body by circulatory system. The heart is covered with a thin layer called pericardium. The heart is four-chambered organ to prevent the intermixing of oxygenated and deoxygenated blood. The upper two chamber are called atria and the lower two chamber are called ventricle.