Q. What is a Heart ? Write in detail about the External Structure and Internal Structure of Heart ?

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Please find this answer-
Heart is the pumping organ of the body which receives deoxygenated blood from the body and pumps oxygenated blood back into circulation.

Structure of the Heart

The human heart is a hollow, upside-down, pear-shaped shell. The inside of the heart is divided into four chambers, the left and right atria and the left and right ventricles, which periodically fill with blood and empty. The two atria form the curved top of the heart. The ventricles meet at the bottom of the heart to form a pointed base which points towards the left side of the chest. The left ventricle contracts most forcefully, so the heart beat is felt most strongly on the left side of the chest. A wall, called the septum, separates the right and left sides of the heart. A valve connects each atrium to the ventricle below it. The mitral or bicuspid valve connects the left atrium with the left ventricle. The tricuspid valve connects the right atrium with the right ventricle.




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