EVERYDAY SCIENCE

Detailed explanation-1: -The testes are known as gonads. Their female counterpart are the ovaries. In addition to their role in the male reproductive system, the testes also have the distinction of being an endocrine gland because they secrete testosterone-a hormone that is vital to the normal development of male physical characteristics.

Detailed explanation-2: -The testes are two oval-shaped male reproductive glands that produce sperm and the hormone testosterone.

Detailed explanation-3: -Male sex hormones, as a group, are called androgens. The principal androgen is testosterone, which is secreted by the testes.

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.

Detailed explanation-5: -Leydig cells produce testosterone in the testes under the pulsatile control of pituitary luteinizing hormone (LH).