Question

can anyone explain me this pls

Answer 1

Hormones are chemical messengers that regulate most functions in the human body. Endocrine glands or ductless glands secrete hormones directly into the bloodstream. Sex hormones control the onset of puberty and initiate the reproduction function. Body changes such as the growth of facial hair and cracking of voice, are initiated due to the secretion of testosterone. Body changes in females during puberty, such as breast development, are initiated by estrogen. At puberty, the level of sex hormones is sufficient to bring about the maturation of gametes, sperm and ovum. The reproductive phase of life lasts longer in males than in females. Menarche is the first occurrence of menstruation. The shedding of the uterine thickening along with its blood vessels is menstruation.
Menopause is the stoppage of menstruation. Fertilization is the fusion of a sperm and an ovum.