Question

the human heart starts beating around .... day of embryonic development
1) 22 nd. 2)20th. 3)21st. 4)23rd
explain why

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correct explanation​

Answer 1

here is your answer mate

Heart development (also known as cardiogenesis) refers to the prenatal development of the human heart. This begins with the formation of two endocardial tubes which merge to form the tubular heart, also called the primitive heart tube, that loops and septates into the four chambers and paired arterial trunks that form the adult heart. The heart is the first functional organ in vertebrate embryos, and in the human, beats spontaneously by week 4 of development.

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