http://www.ck12.org Chapter 1. Human Biology
- During adulthood, testosterone helps a man to produce sperm.
When a hormone is released into the body, we say it is "secreted." Testosterone is secreted by males, but it is not the
only hormone that males secrete. Males also secrete small amounts of estrogen. Even though estrogen is the main
female sex hormone, scientists think that estrogen is needed for normal sperm production in males.
FIGURE 1.127
Testosterone, the main sex hormone in
males, allows men to build larger muscles
than women.Vocabulary
- gamete: Reproductive cell, such as sperm or egg.
- meiosis: Process in cell division during which chromosome number is halved in order to produce gametes.
- reproductive system: Organ system that produces gametes and secretes sex hormones.
- sperm: Male gamete, or reproductive cell.
- testosterone: Main sex hormone in males.