ANATOMY

Detailed explanation-1: -The testes synthesize two important products: testosterone, needed for the development and maintenance of many physiological functions; and sperm, needed for male fertility.

Detailed explanation-2: -The main hormone secreted by the testes is testosterone, an androgenic hormone. Testosterone is secreted by cells that lie between the seminiferous tubules, known as the Leydig cells.

Detailed explanation-3: -The endocrine functions of the testis are controlled by the hypothalamus and the pituitary gland. The hypothalamus secrets gonadotropin releasing and inhibitory substances that regulate the release of the gonadotropins from the anterior pituitary.

Detailed explanation-4: -Testosterone is produced by the gonads (by the Leydig cells in testes in men and by the ovaries in women), although small quantities are also produced by the adrenal glands in both sexes.