The gonad is the organ that makes gametes. A gamete (from Ancient Greek γαμέτης; translated gamete = wife gametes = husband is a cell that fuses with another gamete The gonads in males are the testes and the gonads in females are the ovaries. The testicle (from Latin testiculus, diminutive of testis, meaning "witness" virility plural testes) is the male "Ovaria" redirects here This is also a proposed section and a Synonym of Solanum. The product, gametes, are haploid germ cells. "Haplo" redirects here For the fictional character see The Death Gate Cycle. For example, spermatozoon and egg cells are gametes. A spermatozoon or spermatozoan ( pl spermatozoa) from the Ancient Greek σπέρμα (seed and ζῷον (living being and more commonly known An ovum (plural ova) is a Haploid Female reproductive cell or Gamete. Although medically the gonad term can refer to either male gonads (testicles) or female gonads (ovaries), the vernacular, or slang use of "gonads" (or "nads") usually only refers to the testicles. The testicle (from Latin testiculus, diminutive of testis, meaning "witness" virility plural testes) is the male "Ovaria" redirects here This is also a proposed section and a Synonym of Solanum. Vernacular refers to the Native language of a country or a locality Slang is the use of highly informal Words and expressions that are not considered standard in the speaker's Dialect or Language.
Contents |
Function
In addition to producing gametes, the gonads are a combined glands providing both exocrine and endocrine functions. A gland is an organ in an animal's body that synthesizes a substance for release such as Hormones or Breast milk, often into the Bloodstream Exocrine glands are Glands that secrete their products ( Enzymes into ducts (duct glands The endocrine system is an integrated system of small organs that involve the release of extracellular signaling molecules known as Hormones The endocrine system is instrumental The male and female gonads produce steroid sex hormones, identical to those producted by adrenal cortical cells. A steroid is a Terpenoid Lipid characterized by a Carbon skeleton with four fused rings generally arranged in a 6-6-6-5 fashion The major distinction is the source and relative amounts produced.
Testes
The male gonads, known as the testes or testicles, secrete a class of hormones called androgens, and produce spermatozoa. The testicle (from Latin testiculus, diminutive of testis, meaning "witness" virility plural testes) is the male Androgen is the generic term for any natural or synthetic compound usually a Steroid Hormone, that stimulates or controls the development and maintenance of masculine A spermatozoon or spermatozoan ( pl spermatozoa) from the Ancient Greek σπέρμα (seed and ζῷον (living being and more commonly known The predominant androgen in males is testosterone. Testosterone is a Steroid hormone from the Androgen group In mammals testosterone is primarily secreted in the testes of males and the Ovaries
Regulation
The gonads are controlled hormonally by luteinizing hormone (LH) and follicle-stimulating hormone (FSH) secreted by the anterior pituitary gland. Luteinizing hormone ( LH, also known as lutropin) is a Hormone produced by the Anterior pituitary gland. Follicle-stimulating hormone ( FSH) is a Hormone synthesized and secreted by Gonadotropes in the Anterior pituitary gland. The anterior pituitary (also called the adenohypophysis, from Greek adeno, "gland" hypo, "under" physis, "growth" The anterior pituitary gland's excretion of LH and FSH are, in turn, controlled by the hypothalamus' gonadotropin-releasing hormone. The hypothalamus links the Nervous system to the Endocrine system via the Pituitary gland (hypophysis Gonadotropin-releasing hormone ( GNRH) also known as Luteinizing-hormone releasing hormone ( LHRH) is a tropic Peptide Hormone
Development
Gonads start developing as a common anlage, in the form of gonadal ridges, and only later are differentiated to male or female sex organs. The Prenatal development of the Gonads is a part of the Development of reproductive system and sultimately forms the Testes in males and In Embryology, anlage is the Primordium, the initial clustering of Embryonic cells that serves as a foundation from which a body part or an organ In Embryology, the gonadal ridge (or genital ridge) is the precursor to the Gonads. A sex organ, or primary sexual characteristic, as narrowly defined is any of the anatomical parts of the body which are involved in sexual reproduction and constitute The SRY gene, located on the Y chromosome and encoding the testis determining factor, decides the direction of this differentiation. SRY ( Sex-determining Region Y) is a Sex -determining Gene on the Y chromosome in the Therians (placental mammals and marsupials History See also History of genetics The existence of genes was first suggested by Gregor Mendel (1822-1884 who in the 1860s studied inheritance The Y chromosome is the sex-determining Chromosome in most Mammals including Humans In mammals it contains the gene SRY, which triggers Testis-determining factor ( TDF) is a general term for the Gene (or product thereof that results in Maleness in humans and some other species
In 1943, Matthew Browne started a development of gonads in a part of the development of the urinary and reproductive organs. The development of the urinary and reproductive organs as a part of the Prenatal development, concerns the Urinary system and Sex organs.
Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic