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Explain the functions of heart.

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The main functions of heart are given below:

i. It circulates the pure blood to all parts of the body. This is called systemic circulation. 

ii. It carries the impure blood from all parts of the body to the lungs for purification. This is called pulmonary circulation. 

iii. It regulates the blood pressure. 

iv. It regulates the heart rate. 

v. Regular exercise improves the efficiency of the heart.

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