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DPT 503 > Integumentary System - Hair > Flashcards

Integumentary System - Hair Flashcards

1
Q

Hair consists of _______________________ .

A

Dead keratinized cells

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2
Q

Hair is not located on . . .

A

Palms, soles, lips, nipples and portions of external genitalia

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3
Q

Hair functions:

A
  • warn of insects on skin
  • hair on head guards against physical trauma
  • protect from heat loss
  • shield skin from sunlight
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4
Q

Hairs also called _________, consists of . . .

A

Pili
Flexible strands of dead keratinized cells

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5
Q

Hairs are produced by . . .

A

Hair follicles

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6
Q

Hairs contain . . .

A

Hard keratin

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7
Q

Regions of hairs:

A

Shaft
Root

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8
Q

Shaft is . . .

A

Area that extends above scalp, where keratinization is complete

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9
Q

Roots:

A

Area within scalp, where keratinization is still going on

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10
Q

Three parts of hair shaft:

A

Medulla
Cortex
Cuticle

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11
Q

Medulla:

A

Central core of large cells and air spaces

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12
Q

Cortex:

A

Several layers of flattened cells surrounding medulla

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13
Q

Cuticle:

A

Outer layer consisting of overlapping layers of single cells

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14
Q

Hair pigments are made by _____________ in hair follicles

A

Melanocytes

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15
Q

Combinations of different _____ create all the hair colors

A

Melanin

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16
Q

Red hair has additional ________ pigment

A

Pheomelanin

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17
Q

Gray/white hair results when . . .

A

Melanin production decreases and air bubbles replace melanin in shaft

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18
Q

Hair follicle extends from ______________ to ________

A

Epidermal surface to dermis

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19
Q

Hair bulb:

A

Expanded area at deep end of follicle

20
Q

Hair follicle receptor

A

Sensory nerve endings that wrap around bulb

21
Q

Hair is considered a ______________ receptor

A

Sensory touch

22
Q

Wall of follicle composed of:

A
  • peripheral connective tissue sheath
  • glassy membrane
  • epithelial root sheath
23
Q

Peripheral connective tissue sheath is derived from . . . And is also called . . .

A

Dermis
Fibrous sheath

24
Q

Glassy membrane is . . .

A

Thickened basal lamina

25
Q

Epithelial root sheath is derived from . . .

A

Epidermis

26
Q

Hair matrix:

A

Actively dividing area of bulb that produces hair cells

27
Q

As matrix makes new cells it . . .

A

Pushes older ones upward

28
Q

Arrector pili:

A

Small band of smooth muscle attached to follicle

29
Q

Arrector pili are responsible for . . .

A

Goose bumps

30
Q

Hair papilla

A

Dermal tissue containing a knot of capillaries that supplies nutrients to growing hair

31
Q

Vellus hair

A

Pale, fine body hair of children and adult females

32
Q

Terminal hair

A

Coarse, long hair

33
Q

Terminal hair is found on . . .

A

Scalp and eyebrows

34
Q

At puberty terminal hair appears in . . .

A

Axillary and pubic regions
Face and neck of males

35
Q

_________ and __________ affect hair growth

A

Nutrition and hormones

36
Q

Follicles cycle between ________ and _________ phases

A

Active and regressive

37
Q

Average ___________ growth per week

A

2.25 mm

38
Q

Lose _____ scalp hairs daily

A

90

39
Q

In women, ________ and ________ glands produce small amounts of ___________, but tumors on these organs can cause abnormally large amounts of androgens.

A

Ovaries and adrenal
Androgens

40
Q

Can result in excessive hairiness called . . .

A

Hirsutism

41
Q

Alopecia

A

Hair thinning in both sexes after age 40

42
Q

Baldness

A

Genetically determined and sex-influenced condition

43
Q

Male pattern baldness caused by . . .

A

Follicular response to DHT

44
Q

Telegenic effluvium is __________ caused by ________________

A

Abrupt hair thinning
An abundance of hair follicles entering resting phase at same time

45
Q

Telegenic effluvium can be due to . . .

A

Stress-induced factors such as: hormonal changes, surgery, severe emotional trauma or crash dieting

46
Q

What is one major function of arrector pili muscle contraction that is particularly important in nonhuman mammals?

a) The arrector pili muscle contracts to allow for hair growth.
b) The arrector pili muscle contracts to shed dead hairs.
c) The arrector pili muscle contracts to alarm an approaching predator.
d) All of the above are true.

A

c) The arrector pili muscle contracts to alarm an approaching predator.

47
Q

A female patient with excessive facial hair growth may have which of the following ailments?

a) Excessive estrogen secretion from the ovaries
b) Inadequate secretion of insulin from the pancreas
c) Inadequate secretion of thyroid hormone from the thyroid gland
d) Excessive secretion of androgens from an adrenal tumor

A

d) Excessive secretion of androgens from an adrenal tumor

DPT 503 (14 decks)

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