A sex organ or reproductive organ is any part of an animal's body that is involved in sexual reproduction. The reproductive organs together constitute the reproductive system. The testis in the male, and the ovary in the female, are called the primary sex organs.
Mossesfernsand some similar plants have gametangia for reproductive organs, which are part of the gametophyte. The cones and pollen are not themselves sexual organs.
The Latin term genitaliasometimes anglicized as genitalsis used to describe the externally visible sex organs: The genitals and the internal sex organs are referred to as the secondary sex organs. The primary sex organs are the gonadsa pair of sex organs, specifically the testes in the male or the ovaries in the Women in yoga pants naked. Gonads as primary sex organs, generate reproductive gametes containing inheritable DNA.
They also produce most of the primary hormones that affect sexual development, Women in yoga pants naked regulate other sexual organs and sexually differentiated behaviors.
In general zoology, given the great variety in organs, physiologies, and behaviors involved in copulationmale genitalia are more strictly defined as "all male structures that are inserted in the female or that hold her near her gonopore during sperm transfer"; female genitalia are defined as "those parts of the female reproductive tract that make direct contact with male genitalia or male products sperm, spermatophores during or immediately after copulation".
The visible portion of the mammalian genitals for males consists of the scrotum and penis ; for females, it consists of the vulva labiaclitorisetc.
In placental mammalsfemales have two genital orifices, the vagina and urethra, while males have only one, the urethra. In Women in yoga pants naked prenatal developmentsex organs originate from a common primordium during early gestation and differentiate into male or female sexes. The SRY geneusually located on the Y chromosome and encoding the testis determining factordetermines the direction Women in yoga pants naked this differentiation.
The absence of it allows the gonads to continue to develop into ovaries. Thereafter, the development of the internal, and external reproductive organs is determined by hormones produced by certain fetal gonads ovaries or testes and the cells' response to them. The initial appearance of the fetal genitalia looks basically feminine: If the fetus has testes, and if the testes produce testosterone, and if the cells of the genitals respond to the testosterone, the outer urogenital folds swell and fuse in the midline to produce the scrotum; the protuberance grows larger and straighter to form the penis; the inner urogenital swellings grow, wrap around the penis, and fuse in the midline to form the penile urethra.
Each sex organ in one sex has a homologous counterpart in the other one. See a list of homologues of Women in yoga pants naked human reproductive system. In a larger perspective, the whole process of sexual differentiation also includes development of secondary sexual characteristics such as patterns of pubic and facial hair and female breasts that emerge at puberty. Furthermore, differences in brain structure arise, affecting, but not absolutely determining, behavior.
Intersex is the development of genitalia somewhere between typical male and female genitalia. Once the child is born, the parents are Women in yoga pants naked with decisions that are often difficult to make, such as whether or not to modify the genitalia, assign the child as male or femaleor leave the genitalia as is. Some parents allow their doctors to choose. If they pick the wrong one, their child may begin to show symptoms of transsexualismwhich can lead them to a life of discomfort until they are able to remedy the issue.
Because of the strong sexual selection affecting the structure and function of genitalia, they form an organ system that evolves rapidly.
In many other animals a single posterior orifice, called the cloacaserves as the only opening for the reproductive, digestive, and urinary tracts if present. All amphibians, birds, reptiles, some fish, and a few mammals monotremes, tenrecs, golden moles, and marsupial moles have this orifice, from which they excrete both urine and feces in addition to serving reproductive functions.
Excretory systems with analogous purpose in certain invertebrates are also sometimes referred to as cloacae. The organs concerned with insect mating and the deposition of eggs are known collectively as the external genitalia, although they may be largely internal; their components are very diverse in form. The reproductive system of gastropods slugs and snails varies greatly from one group to another.
Planaria are flat worms widely used in biological research.
There are sexual and asexual planaria. Sexual planaria are hermaphrodites, possessing both testicles and ovaries. Each planarian transports its excretion to the other planarian, giving and receiving sperm. The life cycle of land plants involves alternation Women in yoga pants naked generations between a sporophyte and a haploid gametophyte.
The gametophyte produces sperm or egg cells by mitosis. The sporophyte produces spores by meiosis which in turn develop into gametophytes.
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Any sex organs that are produced by the plant will develop on the gametophyte. The seed plantswhich include conifers and flowering plants have small gametophytes that develop inside the pollen grains male and the ovule female.