Question

define oestrus cycle and menstrual cycle

Answer 1

The oestrous cycle is the reproductive system in most mammals where reproductive hormones cause the cycles to start after puberty in sexually mature females. The menstrual cycle is the regular natural change that occurs in the female reproductive system that makes pregnancy possible.

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Answer 2

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BREAKDOWN AND REMOVAL OF THE INNER , THICK AND SOFT LINING OF THE UTERUS ALONGWITH ITS BLOOD VESSELS IN THE FORM OF VAGINAL BLEEDING IS CALLED MENSTRUATION OR MENSTRUAL CYCLE.