The male reproductive system
The human male reproductive system contains these parts:
- sperm ducts
The two testes (one of them is called a testis) are contained in a bag of skin called the scrotum. The testes have two functions:
- to produce millions of male gametes (sex cells) called sperm
- to make male sex hormones, which affect the way a man's body develops
Sperm duct and glands
The sperm pass through the sperm ducts, and mix with fluids produced by the glands. The fluids provide the sperm cells with nutrients. The mixture of sperm and fluids is called semen.
Penis and urethra
The penis has two functions:
- to pass urine out of the man's body
- to pass semen out of the man's body
The urethra is the tube inside the penis that can carry urine or semen. A ring of muscle makes sure that there is no chance of urine and semen getting mixed up.