sex hormones


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Related to sex hormones: male sex hormones

sex

 [seks]
1. the fundamental distinction, found in most species of animals and plants, based on the type of gametes produced by the individual; also the category to which the individual fits on the basis of that criterion. Called also gender. See also gender identity and gender role.
2. to determine which of these categories an organism belongs in.
chromosomal sex the sex as determined by the presence of the XX (female) or the XY (male) genotype in somatic cells, without regard to phenotypic manifestations. Called also genetic sex.
endocrinologic sex the phenotypic manifestations of sex determined by endocrine influences, such as development of breasts and genital organs.
genetic sex chromosomal sex.
gonadal sex the sex as determined on the basis of the gonadal tissue present (ovarian or testicular).
sex hormones glandular secretions involved in the regulation of sexual functions. The principal sex hormone in the male is testosterone, produced by the testes. In the female the principal sex hormones are the estrogens and progesterone, produced by the ovaries. These hormones influence the secondary sex characters, such as the shape and contour of the body, the distribution of body hair, and the pitch of the voice. The male hormones stimulate production of spermatozoa in men, and the female hormones control ovulation, pregnancy, and the menstrual cycle in women.
morphological sex sex determined on the basis of the morphology of the external genitals.
nuclear sex the sex as determined on the basis of the presence or absence of sex chromatin in somatic cells, its presence normally indicating the XX (female) genotype, and its absence the XY (male) genotype.

sex hor·mones

a general term covering those steroid hormones that are formed by testicular, ovarian, and adrenocortical tissues, and that are androgens, estrogens or progestins.
Synonym(s): gonadal hormones

sex hor·mones

(seks hōr'mōnz)
A general term covering those steroid hormones that are formed by testicular, ovarian, and adrenocortical tissues, and that are androgens or estrogens.

sex hormones

HORMONES that bring about the development of bodily sexual characteristics and regulate sperm and egg production and the menstrual cycle. There are steroids of three main types-androgens (male), oestrogens (female) and PROGESTOGENS that prepare women for, and maintain, pregnancy.

sex hormones

hormones capable of stimulating the development of the reproductive organs and SECONDARY SEXUAL CHARACTERS in mammals. The hormones are ANDROGEN, OESTROGEN and PROGESTERONE.Sex hormones are secreted by the ovaries, testes, adrenal cortex and placenta. see OESTRUS CYCLE.

sex hor·mones

(seks hōr'mōnz)
General term covering those steroid hormones formed by testicular, ovarian, and adrenocortical tissues: androgens, estrogens, or progestins.

sex

1. the fundamental distinction, found in most species of animals and plants, based on the type of gametes produced by the individual or the category to which the individual fits on the basis of that criterion. Ova, or macrogametes, are produced by the female, and spermatozoa, or microgametes, are produced by the male. The union of these distinctive germ cells results in the production of a new individual in sexual reproduction.
2. to determine the sex of an animal.

sex cell
see germ cell, gamete.
sex chromatin
the persistent mass of chromatin situated at the periphery of the nucleus in cells of normal females; it is the material of the inactivated sex chromosome. Called also Barr body.
chromosomal sex
sex as determined by the presence of the XX (female) or the XY (male) genotype in somatic cells, without regard to phenotypic manifestations. Called also genetic sex.
sex chromosomes
see sex chromosomes.
sex determination
1. the change in the fetus to a male or female configuration; the process by which the sex of an organism is fixed, associated, in animals, with the presence or absence of the Y chromosome.
2. diagnosis of the sex of the fetus before birth performed by examination of fetal fluids obtained by amniocentesis.
sex determining region of Y
a single gene responsible for determining the sex of an animal.
sex drive
see libido.
endocrinological sex
the phenotypic manifestations of sex determined by endocrine influences, such as mammary development, etc.
genetic sex
chromosomal sex.
sex glands
in the male includes the prostate, seminal vesicles, ampullae and bulbourethral glands; in the female includes ovaries.
gonadal sex
the sex as determined on the basis of the gonadal tissue present (ovarian or testicular).
sex hormones
glandular secretions involved in the regulation of sexual functions. The principal sex hormone in the male is testosterone, produced by the testes. In the female the principal sex hormones are the estrogens and progesterone, produced by the ovaries.
These hormones influence the secondary sex characters, such as the shape and contour of the body and head, mammary development and the pitch of the voice. The male hormones stimulate production of spermatozoa, and the female hormones control ovulation, pregnancy and the estral cycle.
sex-linkage
includes X-linked (much the most common) and Y-linked loci.
sex-linked inheritance
see sex-linkage (above).
morphological sex
sex determined on the basis of the morphology of the external genitals.
neutrophil sex lobe
see drumstick lobe.
nuclear sex
the sex as determined on the basis of the presence or absence of sex chromatin in somatic cells, its presence normally indicating the XX (female) genotype, and its absence the XY (male) genotype.
sex parity
see sex ratio (below).
sex pheromone
sex ratio
proportion of female to male births.
sex reversal
the sexual condition of animals in which gonadal sex and chromosomal sex are dissimilar.
sex steroids
steroidal compounds acting as hormones in reproductive processes; the principal ones are estrogen, progesterone, testosterone.
References in periodicals archive ?
Table 1 Effect of four mammalian sex hormones and their doses on percentage of regeneration capacity of callus.
Objective: To investigate the association of circulating levels of sex hormone binding globulin with type 2 diabetes mellitus.
Excess weight had the strongest influence on levels of the female sex hormone oestrogen, which are known to fuel around three-quarters of breast tumours.
But in order for you to optimize your sex hormone status, precise and accurate measurement is of paramount importance.
In the analysis of sex hormones by quartile, the researchers observed "an increasing risk of coronary heart disease as you move from the lowest to highest quartiles of testosterone, which was statistically significant," Dr.
What effect, if any, these altered sex hormone levels will have on the participants' breast cancer prognosis awaits follow-up.
The authors write that these findings "support the hypothesis that gender identity develops as a result of an interaction between the developing brain and sex hormones.
As for the relationship between sex hormones and CCA adventitial diameter, only decreased estrogen levels were significantly associated with increased diameters, but in the subset of patients with systolic blood pressure over 140 mm Hg, decreased androgen levels were also strongly associated with larger diameter.
If this study refutes our hypothesis, the idea that sex hormones play a direct role in the immune response to M.
The WHI writing group concluded, "It remains possible that transdermal estradiol and progesterone, which most closely mimic the normal physiology and metabolism of endogenous sex hormones, may provide a different risk profile.
Steroids confuse the hypothalamus, the part of the brain that controls sex hormones.
In Beyond the Natural Body: An Archaeology of Sex Hormones, endocrinologist Nelly Oudshoorn details the early research into so-called sex hormones during the late 19th and early 20th century.