Answer:
When the penis is erect, the flow of urine is blocked from the urethra, allowing only semen to be ejaculated at orgasm. The scrotum is the loose pouch-like sac of skin that hangs behind the penis. It holds the testicles (also called testes), as well as many nerves and blood vessels.
Explanation:
Proteins are needed for growth and development of human body cells.
