Chapter 1- Hair Flashcards

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1
Q

Name 3 functions of hair

A
  1. thermal insulation 2. sensory perception 3. barrier
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2
Q

Hair is a barrier against which 3 types of injuries?

A
  1. chemical 2. physical 3. microbial
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3
Q

Is hair photoprotective?

A

Yes

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4
Q

What is the function of glossiness of the haircoat

A

reflection of sunlight

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5
Q

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

A

light

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6
Q

What enzyme is a marker of early anagen hair follicles?

A

Transglutaminase

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7
Q

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

A
  1. rate of hair growth 2. duration of anagen
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8
Q

Primary hairs are aka

A

outercoat, guard

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9
Q

Secondary hairs are AKA

A

undercoat

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10
Q

Are hairs medullated or nonmedullated in dogs and cats?

A

medullated

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11
Q

A term meaning nonmedullated

A

lanugo

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12
Q

In cats, are primary or secondary hairs more numerous?

A

Secondary hairs

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13
Q

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

A

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

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14
Q

Name the 3 types of cat hairs based on gross appearance

A
  1. guard hairs 2. awn hairs 3. down hairs
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15
Q

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

A

guard hairs

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16
Q

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

A

awn hairs

17
Q

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

A

down hairs

18
Q

What determines the shape of the hair fiber?

A

Shape of the hair follicle

19
Q

Do hairs grown THROUGH the skin or FROM the skin?

A

FROM the skin

20
Q

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

A

F

21
Q

T or F: Puppies lose their puppy coat

A

F- they gain an adult coat

22
Q

During what time period do puppies produce their secondary hairs?

A

12 to 28 weeks of life

23
Q

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

A

Obliquely (30 to 60 degrees)

24
Q

Trichoglyphics is the study of what?

A

hair tract patterns

25
Q

What direction does the hair slope generally run?

A

Caudally and ventrally

26
Q

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

A

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

27
Q

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

A

32.7 g/kg

28
Q

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

A

60 to 180 g/kg, depending on the breed