The hypothalamus secretes this hormone into the pituitary gland in the brain. The first barrier to sperm is made up of so-called cumulus cells embedded in a gel-like substance made primarily of hyaluronic acid. When muscles in the penis contract to stop the inflow of blood and open outflow channels, erection is reversed.
Testes in prepubertal boys change little in size from about 1 year of age to the onset of puberty, averaging about 2—3 cc in volume and about 1. The cell is characterized by a minimum of cytoplasm. The opening of the urethra, the tube that transports semen and urine, is at the tip of the glans penis.
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At the center of the penis is a tube, the urethra, which carries urine and semen out of the body. The first division is done by mitosis, and ensures a constant supply of spermatocytes, each with the diploid number of chromosomes.
The penis continues to grow until about 18 years of age, reaching an average adult size of about cm.
Does a man go through menopause?