Question

why does menstruation occur ???​

Answer 1

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The menstrual cycle occurs due to the rise and fall of hormones. This cycle results in the thickening of the lining of the uterus, and the growth of an egg, (which is required for pregnancy).

If pregnancy does not occur, the lining is released in what is known as menstruation.

Answer 2

WHAT IS MENSTRUATION??

In females, the ovaries become active when the girl reaches puberty; this is normally between 11-13 years of age. One ovum, in one of the ovaries, becomes mature once in about 28 days. The mature ovum enters the oviduct where it may get fertilised. If fertilised, it develops and reaches the uterus where the foetus grows and develops inside it. Before the embryo enters the uterus, the uterus prepares itself to receive it by forming a thick lining of blood vessels. If fertilization does not occur, the egg disintegrates and the lining of blood vessels is shed off. This process of blood flow is termed as Menstruation.

WHY DOES IT OCCUR??

Most of the changes that occur in adolescents are controlled by hormones. Hormonal balance in adolescents shifts strongly towards an adult state. This is triggered by Pituitary gland, it secretes hormones. When girls reaches to the age of 11-13 the pituitary gland starts releasing the hormone called estrogen and progesterone (from ovaries).

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