front 1 Name 5 skin appendages. | back 1 Hair
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front 2 What is the main function of body hair? | back 2 To sense insects before they bite or sting. |
front 3 What are three reasons for having hair on your head? | back 3 Guards against head trauma, heat loss, and sunlight |
front 4 What are flexible strands produced by hair follicles? | back 4 Hairs |
front 5 What is another word for hairs? | back 5 Pili |
front 6 What are the chief regions of the hair? | back 6 The shaft and root |
front 7 In the shaft, keratinization is ________, but in the root, keratinization is ________. | back 7 Complete...
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front 8 What are the three concentric layers of keratinized cells in a hair? | back 8 Medulla, cortex, cuticle |
front 9 Which of the three is absent from fine hairs? | back 9 The medulla |
front 10 The _______ consists of large cells and airspaces. | back 10 Medulla |
front 11 What's the bulky layer surrounding the medulla? | back 11 The cortex |
front 12 The ________ is formed from a single layer of cells overlapping one another. | back 12 Cuticle |
front 13 When the cuticle wears away at the tip of the hair shaft, allowing keratin fibrils in the cortex and medulla to frizz out. This is called a ________. | back 13 Split end |
front 14 Hair pigment is made by _______ at the base of the hair follicle, and transferred to the cortical cells. | back 14 Melanocytes |
front 15 How is red hair colored? | back 15 By an iron-containing pigment called trichosiderin |
front 16 When melanin production decreases, and air bubbles replace melanin in the hair shaft, the hair ________. | back 16 Turns gray (or white) |
front 17 ________ fold down from the epidermal surface into the dermis. | back 17 Hair follicles |
front 18 The deep end of the follicle expands to form a ________. | back 18 Hair bulb |
front 19 A knot of sensory nerve endings is called a ________. | back 19 Hair follicle receptor |
front 20 A hair follicle receptor is also called a ________. | back 20 Hair root plexus |
front 21 A hair follicle receptor or hair root plexus wraps around each _______. | back 21 Hair bulb |
front 22 ________ is a nipplelike bit of dermal tissue that protrudes into the hair bulb. | back 22 Hair papilla |
front 23 What supplies nutrients to the growing hair and signals it to grow? | back 23 Papilla |
front 24 The wall of the hair follicle is composed of what 3 things? | back 24 The outer peripheral connective tissue sheath
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front 25 The actively dividing area of the hair bulb that produces the hair is the ________. | back 25 Hair matrix |
front 26 The hair matrix originates from the _____ _____. | back 26 Hair bulge |
front 27 The two classifications of hair are: | back 27 Vellus
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front 28 The coarse, longer hair is ________, and pale, fine hair is _________. | back 28 Terminal...
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front 29 Terminal hairs of puberty grow in response to the effects of ________. | back 29 Androgens |
front 30 What is excessive hairiness called? | back 30 Hirsutism |
front 31 Hair thinning and some degree of baldness is called ________. | back 31 Alopecia |
front 32 ________ is when the immune system attacks the follicles and the hair falls out in patches. | back 32 Alopecia areata |
front 33 The white crescent of the nail is called: | back 33 Lunule |
front 34 The borders of the nails are overlapped by skinfolds called ________. | back 34 Nail folds |
front 35 The fold that projects onto the body is the ________. | back 35 Cuticle |
front 36 The thickened region beneath the free edge of the nail is the ________. | back 36 Hyponychium |
front 37 Sweat glands are also called ________. | back 37 Sudoriferous glands |
front 38 How many sweat glands does the average person have? | back 38 Up to 3 million |
front 39 What are the two types of sweat glands? | back 39 Eccrine
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front 40 Eccrine sweat glands are also called _______. | back 40 Merocrine sweat glands |
front 41 Sweat is 99% ________. | back 41 Water, salts, vitamin C, antibodies, dermcidin, and traces of metabolic waste. |
front 42 Sweat is _______, with a Ph between ___ and ___. | back 42 Acidic...
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front 43 ________ glands begin functioning at puberty and play little role in maintaining a constant body temp. | back 43 Apocrine |
front 44 Modified apochrine glands found in the lining of the external ear canal | back 44 Ceruminous |
front 45 Oil glands are also called ________ glands. | back 45 Sebaceous |
front 46 True or False:
| back 46 False
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front 47 Sebaceous glands produce an oily substance called ________. | back 47 Sebum |
front 48 Overactive sebaceous glands can cause ________ in infants. This is also called _______. | back 48 Seborrhea...
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