Hair

Question 0

hair follicle

Answer 0

diagonal tube of epithelium and connective tissue that originates deep in the epidermis

Question 1

accessory organs (appendages)

Answer 1

hair, nails, cutaneous glands

Question 2

pilus

Answer 2

hair; slender filament of keratinized cells that grow from hair follicle

Question 3

shaft

Answer 3

portion above skin surface

Question 4

root

Answer 4

hair shaft below surface, within the follicle

Question 5

bulb

Answer 5

swelling at end of root

Question 6

dermal papilla

Answer 6

bit of vascular connective tissue that provides hair with its sole source of nutrition

Question 7

hair matrix

Answer 7

exclusive site of cellular mitosis and hair growth

Question 8

cuticle

Answer 8

surface layer of a hair; composed of thin scaly cells that overlap each other and resist pulling of hair out of its follicle

Question 9

cortex

Answer 9

composed of several layers of elongated keratinized cells, makes up bulk of hair

Question 10

medulla

Answer 10

composed of loosely arranged cells and air spaces, only in thickest hairs

Question 11

root sheath

Answer 11

composed of layer of epithelium alongside the hair, layer of condensed dermal connective tissue around epithelial layer

Question 12

hair receptors

Answer 12

nerve fibers that coil around follicle and respond to hair movements

Question 13

piloerector (pilomotor) muscle

Answer 13

smooth muscle that contracts in response to stimuli and pulls the follicle into a more vertical position and makes hair stand upright

Question 14

eumelanin

Answer 14

melanin that makes black or brown hair

Question 15

pheomelanin

Answer 15

sulfur-rich melanin that makes blond and orange to red hair if very little melanin

Question 16

guard hairs (vibrissae)

Answer 16

block foreign particles from from nostrils, auditory canals, and eyes