Question

hi , guys what do understand by the word double pumping of heart.​

Answer 1

Explanation:

Double Circulation: In the human heart, blood passes through the heart twice in one cardiac cycle.This type of circulation is called double circulation. Double circulation ensures complete segregation of oxygenated and deoxygenated blood which is necessary for optimum energy production in warm-blooded animals.

Answer 2

new cells are formed in an organism in order to grow to replace old dead and injured cell and to form required for reproduction the process by which new cells are made is called cell division there are two main types of cell division mitosis and meiosis ...,

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