____ occurs in the _____ producing sperm with 23 chromosomes. Each human sperm cell has three parts--a head, a middle region, and a tail. The head contains the nucleus with the chromosomes. the acrosome at the tip of the head enables the sperm to fertilize the eggs. The middle region contains the ____ which produce energy. The tail, a long and slender flagellum, moves the sperm.
The testes are housed in the scrotum. From the testes, sperm passes through the ______, which is a storage and maturation area, to the _______ where they are housed until delivery. The ______ at the base of the urethra secretes a fluid that has a stimulating effect on the sperm. During intercourse, they travel to the ___________, where the reproductive and urinary tracts join, emptying through the ________. An adult male produces ________ continuously, several hundred million each day of his life. Those that are not ejaculated from the body are ______ in a continual cycle of renewal.