Reaching The Age of Adolescence Notes

Menstruation and menstrual cycle

MENSTRUATION AND MENSTRUAL CYCLE

SEX DETERMINATION IN HUMAN BEINGS

Information of each body function is coded by genes which are located on chromosomes.
All human beings have 23 pairs of chromosomes in the nuclei of their cells. Out of these 22 pairs code for somatic body parts and one pair is known as sex chromosomes.
Sex chromosome in male is not a perfect pair, i.e., the two members are different from each other. It is a mismatched pair in which one is a normal-sized X while the other is a short one called Y.
Females have a perfect pair of sex chromosomes, both called X. So women are XX, while men are XY.

HORMONES OTHER THAN SEX HORMONES

The glands that secrete hormones directly into blood stream are known as endocrine glands. Different endocrine glands together constitute the endocrine system.

Endocrine

Hormones