The human reproductive system and the ability to reproduce make life possible. The primary function of the human reproductive system is to produce sex cells. When a male and female sex cell unite, an offspring grows and develops. The reproductive system is usually comprised of either male or female reproductive organs and structures. Human sex cells contain one complete set of 23 chromosomes. Stem cells develop into mature sperm cells by first dividing mitotically to produce identical copies of themselves and then meiotically to create unique daughter cells called spermatids.
Organ (anatomy) - Wikipedia
Sexual intercourse or simply called sex is the insertion and thrusting of a male's penis into a female's vagina. Sometimes sexual intercourse is called coitus or copulation and is more casually known as having sex or sleeping together. The two animals may be of opposite sexes or they may be hermaphroditic , as is the case with snails. Humans sometimes engage in behaviors that do not include the penetration of sexual organs , such as oral intercourse or anal intercourse or by non-sexual organs fingering , fisting. These behaviors are sometimes included in the definition of sexual intercourse. Two animals coming together for the purposes of sexual reproduction is called mating.
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Triplet birth Single lamb. Twin lambs. Pregnant Katahdin ewe Seaonally polyestrus Katahdin ewes Young ewe lamb. Range ewes.
From Wikimedia Commons, the free media repository. Subcategories This category has the following 11 subcategories, out of 11 total. Media in category "Sheep anatomy" The following 31 files are in this category, out of 31 total. A text-book of veterinary anatomy Page BHL