Chapter 1- Hair

Question 1

Name 3 functions of hair

Answer 1

1. thermal insulation 2. sensory perception 3. barrier

Question 2

Hair is a barrier against which 3 types of injuries?

Answer 2

1. chemical 2. physical 3. microbial

Question 3

Is hair photoprotective?

Answer 3

Yes

Question 4

What is the function of glossiness of the haircoat

Answer 4

reflection of sunlight

Question 5

Are dark or light colored coats more efficient in hot sunny weather?

Answer 5

light

Question 6

What enzyme is a marker of early anagen hair follicles?

Answer 6

Transglutaminase

Question 7

What two things determine the final length of the hair shaft?

Answer 7

1. rate of hair growth 2. duration of anagen

Question 8

Primary hairs are aka

Answer 8

outercoat, guard

Question 9

Secondary hairs are AKA

Answer 9

undercoat

Question 10

Are hairs medullated or nonmedullated in dogs and cats?

Answer 10

medullated

Question 11

A term meaning nonmedullated

Answer 11

lanugo

Question 12

In cats, are primary or secondary hairs more numerous?

Answer 12

Secondary hairs

Question 13

What is the ratio of secondary hairs to primary hairs in the cat DORSALLY and VENTRALLY

Answer 13

10:1 (dorsally); 24:1 (ventrally)

Question 14

Name the 3 types of cat hairs based on gross appearance

Answer 14

1. guard hairs 2. awn hairs 3. down hairs

Question 15

Describes what type of cat hair: Thickest, straight, evenly tapered to a fine tip

Answer 15

guard hairs

Question 16

Describes what type of cat hair: Thin, possessing subapical swelling below the hair tip

Answer 16

awn hairs

Question 17

Describes what type of cat hair: Thinnest, evenly crimped, or undulating

Answer 17

down hairs

Question 18

What determines the shape of the hair fiber?

Answer 18

Shape of the hair follicle

Question 19

Do hairs grown THROUGH the skin or FROM the skin?

Answer 19

FROM the skin

Question 20

T or F: New hair follicles can be formed after birth

Answer 20

F

Question 21

T or F: Puppies lose their puppy coat

Answer 21

F- they gain an adult coat

Question 22

During what time period do puppies produce their secondary hairs?

Answer 22

12 to 28 weeks of life

Question 23

In what direction do hair follicles grow in relation to the epidermis?

Answer 23

Obliquely (30 to 60 degrees)

Question 24

Trichoglyphics is the study of what?

Answer 24

hair tract patterns

Question 25

What direction does the hair slope generally run?

Answer 25

Caudally and ventrally

Question 26

What are the benefits of the hair slope running caudally and ventrally?

Answer 26

Minimal impediment to forward motion; ability of water to flow off body to the ground without soaking the haircoat

Question 27

What is the yearly amount of hair growth that adult shorthaired cats produce?

Answer 27

32.7 g/kg

Question 28

What is the yearly amount of hair growth that dogs produce?

Answer 28

60 to 180 g/kg, depending on the breed