hair

Question 1

hair

Answer 1

filament of keratinized cells which grow from hair follicles

Question 2

downy hair

Answer 2

very fine and unpigmented (found on fetus)

Question 3

vellus hair

Answer 3

fine pale hair
–> 2/3 females, 1/10 male

Question 4

terminal hair

Answer 4

longer, coarser, more heavily pigmented
–> scalp, eyebrows, axillary/pubic hair

Question 5

shaft

Answer 5

above surface

Question 6

root

Answer 6

below surface

Question 7

bulb

Answer 7

end of root that forms around dermal papillae

Question 8

papilla

Answer 8

how hair receives nutrients

Question 9

matrix

Answer 9

where growth occurs

Question 10

layers of keratinized cells

Answer 10

medulla, cortex, cuticle

Question 11

medulla

Answer 11

core; most prominent in thick hair

Question 12

cortex

Answer 12

outer/middle portion; pigments are found here

Question 13

cuticle

Answer 13

outermost layer; cells are like roof shingles (overlap)

Question 14

sensory fibers

Answer 14

plexus of nerves wrapped around follicle

Question 15

arrector pili muscle

Answer 15

made of smooth muscle
–> contracts and causes hair follicle to stand up right