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sexual reproduction

Terms

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ovaries
the female gonad or reproductive gland, in which the ova and the hormones that regulate female secondary sex characteristics develop.
epididymis
an elongated organ on the posterior surface of a testis that constitutes the convoluted beginning of the vas deferens.
hypothalamus
a region of the brain, between the thalamus and the midbrain, that functions as the main control center for the autonomic nervous system by regulating sleep cycles, body temperature, appetite, etc., and that acts as an endocrine gland by producing hormones, including the releasing factors that control the hormonal secretions of the pituitary gland.
testostrone
the sex hormone, C19H28O2, secreted by the testes, that stimulates the development of male sex organs, secondary sexual traits, and sperm.
gastrulation
the formation of a gastrula.
zygote
the cell produced by the union of two gametes, before it undergoes cleavage
seminal fluid
the fluid component of semen, excluding the sperm.
ovulation
to produce and discharge eggs from an ovary or ovarian follicle.
vas defrens
The vas deferens (plural: vasa deferentia), also called ductus deferens, (Latin: "carrying-away vessel"), and in lay talk sperm tube is part of the male anatomy of some species, including humans.
blastocyst
the blastula of the mammalian embryo, consisting of an inner cell mass, a cavity, and an outer layer, the trophoblast.
ovum
the female reproductive cell or gamete of animals, which is capable of developing, usually only after fertilization, into a new individual.
menstral cycle
the cycle of menstruation
fallopian tube
one of a pair of long, slender ducts in the female abdomen that transport ova from the ovary to the uterus and, in fertilization, transport sperm cells from the uterus to the released ova; the oviduct of higher mammals.
gonad
a sex gland in which gametes are produced; an ovary or testis.
ectoderm
the outer germ layer in the embryo of a metazoan.
sperm
a male reproductive cell; spermatozoon.
estrogens
Any of several steroid hormones produced chiefly by the ovaries and responsible for promoting estrus and the development and maintenance of female secondary sex characteristics.
embryo
the young of a viviparous animal, esp. of a mammal, in the early stages of development within the womb, in humans up to the end of the second month.
penis
the male organ of copulation and, in mammals, of urinary excretion.
placenta
the organ in most mammals, formed in the lining of the uterus by the union of the uterine mucous membrane with the membranes of the fetus, that provides for the nourishment of the fetus and the elimination of its waste products.
mesoderm
the middle germ layer of a metazoan embryo.
morula
the mass of cells resulting from the cleavage of the ovum before the formation of a blastula.
pituitary gland
A small oval endocrine gland attached to the base of the vertebrate brain and consisting of an anterior and a posterior lobe, the secretions of which control the other endocrine glands and influence growth, metabolism, and maturation.
puberty
the period or age at which a person is first capable of sexual reproduction of offspring: in common law, presumed to be 14 years in the male and 12 years in the female.
umbilical cord
a cord or funicle connecting the embryo or fetus with the placenta of the mother and transporting nourishment from the mother and wastes from the fetus.
uterus
the enlarged, muscular, expandable portion of the oviduct in which the fertilized ovum implants and develops or rests during prenatal development; the womb of certain mammals.
semen
the viscid, whitish fluid produced in the male reproductive organs, containing spermatozoa.
vagina
the passage leading from the uterus to the vulva in certain female mammals
testes
the male gonad or reproductive gland, either of two oval glands located in the scrotum.
fetus
the young of an animal in the womb or egg, esp. in the later stages of development when the body structures are in the recognizable form of its kind, in humans after the end of the second month of gestation
androgens
A steroid hormone, such as testosterone or androsterone, that controls the development and maintenance of masculine characteristics.
menstration
the periodic discharge of blood and mucosal tissue from the uterus, occurring approximately monthly from puberty to menopause in nonpregnant women and females of other primate species.

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