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Related Flashcards
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Cards In This Set
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Describe how hair responds to cold temperature or strong emotion.
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Nerve impulses may stimulate the erector pili muscles to contract, raising gooseflesh (goose bumps)
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How is hair formed in the follicle?
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Develops from the epidermal cell at the base of hair follicle and then new hair grows and replaces old
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What is folliculitis?
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Inflammation of hair follicles
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Describe several forms of baldness.
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1) androgenic alopecia: abnormal hormone levels (testosterone) 2) alopecia areata (oval bald spots): antibodies attack follicles3) temporary hair loss due to antibodies
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How is baldness treated? How effective are the various treatments for baldness?
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Rogaine; hair transplants (successful); hair products
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Explain how various hair colors are produced.
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Genes that direct the type and amount of pigment in hair cells
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Where is the growing portion of the nail located?
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Lunula: whitish, thickened half-moon shaped region at the base of the nail plate
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Discuss the clinical significance of the appearance of the nails.
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Mirrors health (blush nail beds= reflect circulation problem; white nail bed/oval depressions=indicate anemia; pigmented spot under nail= may be a melanoma; horizontal furrows= malnutrition; curvature= lung, heart, and liver; red streaks= rheumatoid arthritis, ulcers, and hypertension )
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Where are the sebaceous glands located, and what is the function of the substance they secrete?
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Scattered throughout the skin in all regions (not on palms or soles) usually associated with hair follicles and secrete sebum: helps keep hair and skin soft, pliable, and waterproof
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Compare apocrine and eccrine sweat glands in relation to location, association with other skin structures, and activating stimuli.
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Apocrine: located- axillary regions, groin, areas around nipples, moisten skin; when- pain, sexual arouse, emotional, upsetEccrine: forehead, neck, back, palms, soles; when- respond body temperature elevated by environmental heat or physical exercise
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Describe the mechanisms that lead to acne. How is it treated?
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Hormonally induced adrenal glands (hormone) stimulate excess sebum secretion; antibiotics, creams, steroids, birth control
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Radiation
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Heat moves from the warm body to cooler air via infrared heat waves
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Conduction
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Heat moves away from the body by contact with a cool object
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Convection
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Heat is lost by continuous circulation of air over the body
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Evaporation
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Sweat changes to vapor and carries heat away from the body
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