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Testosterone is the primary male sex hormone and androgen in males. [3] In humans, testosterone plays a key role in the development of male reproductive tissues such as testicles and prostate, as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair.
A testicle or testis (pl. testes) is the gonad in all male bilaterians, including humans, and is homologous to the ovary in females. Its primary functions are the production of sperm and the secretion of androgens, primarily testosterone. The release of testosterone is regulated by luteinizing hormone (LH) from the anterior pituitary gland.
Though women also produce testosterone, men produce 20 to 25 times more in comparison, and about 95 percent of it is made in the testicles. But the testes don’t work alone — they rely on ...
Intratesticular testosterone levels are 20–100 or 50–200 times higher than the concentration found in blood, although there is variation over a 5- to 10-fold range amongst healthy men. [29] [30] Testosterone production does not remain constant throughout the day, but follows a circadian rhythm. The maximum peak of testosterone occurs at 8 a ...
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Problems with the pituitary gland or hypothalamus, which are parts of the brain that tell the testicles to produce testosterone, can lower your levels of the hormone. This might include Kallmann ...
Testosterone secretion by the interstitial cells of the testes then causes the growth and development of the mesonephric ducts into male secondary sex organs. [7] The Müllerian ducts atrophy, but traces of their anterior ends are represented by the appendices testis ( hydatids of Morgagni of the male), while their terminal fused portions form ...
Testosterone, which is produced by your testicles, “plays a key role in the development of characteristics like libido, and growth of the penis and testicles,” says Jamin Brahmbhatt, MD, a ...