CH 10 Integumentary System (hair)

Question 1

Hair

Answer 1

• rod-like fibers made of dead protein cells filled with keratin
• pil/i, pil/o, trich/o

Question 2

Cuticle, cortex, medulla

Answer 2

Cuticle - one cell layer thick and appears scaley

Cortex - main part of hair shaft, multiple layers, gives color

Medulla - innermost component of the hair shaft

Question 3

Hair follicles

Answer 3

sacs that hold the hair fibers

Question 4

Arrector pili

Answer 4

a tiny muscle attached to the hair follicle that causes the hair to stand erect in response to cold temps or stressful situations

-dogs use this when “raising the hackles”

Question 5

Piloerection

Answer 5

condition of the hair standing straight up

Question 6

Fur

Answer 6

short, fine, soft hair

Question 7

Pelt

Answer 7

skin plus fur or hair

Question 8

Guard hairs

Answer 8

long, straight, stiff hairs that form the outer coat

• aka primary hairs or topcoat
• include tail and mane hai, bristly hair of swine, and most of the fur hair

Question 9

Secondary hairs

Answer 9

finer, softer, and wavy hair

• aka undercoat
• include wool and wavy hair located near the skin of rabbits

Question 10

Tacile hair

Answer 10

long, brittle, extremely sensitive hairs usually located on the face

-aka vibrissae (whiskers)

Question 11

Cilia

Answer 11

thin, short hairs

-Ex eyelashes

Question 12

Simple pattern hair growth

Answer 12

guard hairs grow from separate follicular openings as in cattle

Question 13

Compound pattern hair growth

Answer 13

multiple guard hairs grow from single follicles as in dogs

Question 14

Shedding

Answer 14

normal hair loss due to temperature, hormones, photoperiod (light), nutrition, and other nondisease causes