The fluids provide the sperm cells with nutrients. The mixture of sperm and fluids is called semen. The urethra is the tube inside the penis that can carry urine or semen. A ring of muscle makes ...

This miniature human was called a homonculus, and scientists thought it was fully pre-formed inside either a sperm cell or an egg cell, and needed just a womb to grow in or a sperm to jump-start.

Meiosis, as described above, is the process by which certain sex cells are created. If you're male, your body uses meiosis to create sperm cells; if you're female, it uses meiosis to create egg cells.

Female gametes are called ova or egg cells, and male gametes are called sperm. Gametes are haploid cells, and each cell carries only one copy of each chromosome. These reproductive cells are ...