Sex Hormones

Sex hormones are produced by the ovaries in the woman and the testes in the man, to give each sex its characteristic appearance. In men, they are responsible for the enlargement of the penis and scrotum at puberty, the development of facial hair and the ability to produce sperm and…

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Stretch Marks

Stretch marks (striae or stria gravidarum) are the curse of pregnant women, when they develop on their belly and breasts, and overweight people whose stretch marks persist after they have lost weight. The tendency to develop striae is one that may be inherited. They are caused by a break down…

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Stewart-Treves Syndrome

Stewart-Treves syndrome is a sarcoma (form of cancer) of an arm affected by lymphoedema (hard swelling) in the elderly. The lymphoedema usually follows mastectomy (breast removal) for cancer. A purplish red growth (angiosarcoma) develops on the lymphoedematous limb. The diagnosis is confirmed after surgical removal of the tumour and examination…

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Skin Tag

A skin tag (cutaneous papilloma or fibroepithelial polyp are the technical names) is a protuberant lump on the skin that has a narrow attachment to the body. They are more common in women and obese people, and appear more frequently after middle age. The cause is friction to the skin…

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Silicone

Silicone is an inert polymer that is stable at a wide range of temperatures and resists water. It is used in medicine as prostheses (eg. breast), lubricants, sealants and adhesives. It is also used to coat the inside of some blood collecting tubes to prevent the blood from adhering to…

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Sheehan Syndrome

Sheehan syndrome is also known as postpartum pituitary necrosis. It is a condition that may occur in  women who experience massive blood loss during childbirth. Damage to the pituitary gland under the brain occurs due to a sudden drop in blood pressure. The result is that the oxygen that the blood normally…

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Secondary Sexual Characteristics

The primary sexual characteristics are the genitals (penis and testes in males, vagina and ovaries in females) and their direct connections that are responsible for the sexual act and reproduction. The secondary sexual characteristics are all the other features that are peculiar to one sex or the other and that…

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