Has the shape of a slender filament it is composed of

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Fundamentals of Organic Chemistry
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Chapter 16 / Exercise 16.43
Fundamentals of Organic Chemistry
McMurry
Expert Verified
, has the shape of a slender filament; it is composed of keratinized cells growing from hair follicles that extend deep into the dermis, often projecting into the underlying subcutaneous layer. Three zones can be recognized along the length of a hair: the hair bulb, root, and shaft. The hair bulb consists of epithelial cells and is a swelling at the base where the hair originates in the dermis. The epithelium at the base of the bulb surrounds a small hair papilla, which is composed of a small amount of connective tissue containing tiny blood vessels and nerves. The root is the zone of the hair extending from the bulb to the skin surface. The shaf is the third portion of the hair that extends beyond the skin surface. The hair bulb contains living epithelial cells, whereas the root and shaft consist of dead epithelial cells. 15. Briefly describe the functions of hair.
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Fundamentals of Organic Chemistry
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Chapter 16 / Exercise 16.43
Fundamentals of Organic Chemistry
McMurry
Expert Verified
Heat retention. Hair on the head prevents the loss of conducted heat from the scalp to the surrounding air. Individuals who have lost their scalp hair release much more heat through the scalp than those who have a full head of hair. Sensory reception. Hair has associated tactile receptors (hair root plexuses) that detect light touch. Visual identification. Hair characteristics are important in determining age and sex, and in identifying individuals. (Hair analysis also assists in determining animal species.) Chemical signal dispersal. Hairs help disperse pheromones, which are chemical signals involved in attracting members of the opposite sex and in sex recognition. Pheromones are secreted by specific sweat glands onto hairs in the axillary and pubic regions. 16. Name the three different types of hair.

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