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Hair is a stratified squamous keratinized epithelium made of multi-layered flat cells whose rope-like filaments provide structure and strength to the hair shaft. The protein called keratin makes up hair and stimulates hair growth. Hair follows a specific growth cycle with three distinct and concurrent phases: anagen, catagen, and telogen. Each ...
Hirsutism is excessive body hair on parts of the body where hair is normally absent or minimal. The word is from early 17th century: from Latin hirsutus meaning "hairy". [2] It usually refers to a male pattern of hair growth in a female that may be a sign of a more serious medical condition, [3] especially if it develops well after puberty. [4]
In many cases, areas on the human body that contain vellus hair will begin to produce darker and thicker body hair during puberty, such as the first growth of beard hair on a male and female adolescent's previously smooth chin; although it may appear thinner on the female. Androgenic hair follows the same growth pattern as the hair that grows ...
[31] [32] One study found that in female dogs there is an increasing risk of urinary incontinence the earlier the procedure is carried out; the study recommended that female dogs be spayed no earlier than 3 to 4 months of age. [28] A later study comparing female dogs spayed between 4 and 6 months and after 6 months showed no increased risk. [33]
The hair follicle is an organ found in mammalian skin. [1] It resides in the dermal layer of the skin and is made up of 20 different cell types, each with distinct functions.. The hair follicle regulates hair growth via a complex interaction between hormones, neuropeptides, and immune cells
[citation needed] Overall, male secondary sex characteristics include: Growth of body hair, including underarm, abdominal, chest, and pubic hair. [4] [1] Growth of facial hair. [1] Enlargement of the larynx (Adam's apple) and deepening of the voice. [1] [24] Increased stature; adult males are taller than adult females, on average. [1]
Basic anatomical features of female and male humans. These models have had body hair and male facial hair removed and head hair trimmed. Most aspects of human physiology are closely homologous to corresponding aspects of animal physiology. The dental formula of humans is: 2.1.2.3 2.1.2.3.
Androgenic alopecia, or male pattern hair loss, is a common cause of concern to men. It may be treated with varying rates success by medication (e.g. finasteride, minoxidil) or hair transplantation. If the scalp is heavy and loose, a common change with ageing, the forehead may be low, heavy and deeply lined.