Integumentary System - Hair

Question 1

Hair consists of _______________________ .

Answer 1

Dead keratinized cells

Question 2

Hair is not located on . . .

Answer 2

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

Question 3

Hair functions:

Answer 3

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

Question 4

Hairs also called _________, consists of . . .

Answer 4

Pili
Flexible strands of dead keratinized cells

Question 5

Hairs are produced by . . .

Answer 5

Hair follicles

Question 6

Hairs contain . . .

Answer 6

Hard keratin

Question 7

Regions of hairs:

Answer 7

Shaft
Root

Question 8

Shaft is . . .

Answer 8

Area that extends above scalp, where keratinization is complete

Question 9

Roots:

Answer 9

Area within scalp, where keratinization is still going on

Question 10

Three parts of hair shaft:

Answer 10

Medulla
Cortex
Cuticle

Question 11

Medulla:

Answer 11

Central core of large cells and air spaces

Question 12

Cortex:

Answer 12

Several layers of flattened cells surrounding medulla

Question 13

Cuticle:

Answer 13

Outer layer consisting of overlapping layers of single cells

Question 14

Hair pigments are made by _____________ in hair follicles

Answer 14

Melanocytes

Question 15

Combinations of different _____ create all the hair colors

Answer 15

Melanin

Question 16

Red hair has additional ________ pigment

Answer 16

Pheomelanin

Question 17

Gray/white hair results when . . .

Answer 17

Melanin production decreases and air bubbles replace melanin in shaft

Question 18

Hair follicle extends from ______________ to ________

Answer 18

Epidermal surface to dermis

Question 19

Hair bulb:

Answer 19

Expanded area at deep end of follicle

Question 20

Hair follicle receptor

Answer 20

Sensory nerve endings that wrap around bulb

Question 21

Hair is considered a ______________ receptor

Answer 21

Sensory touch

Question 22

Wall of follicle composed of:

Answer 22

• peripheral connective tissue sheath
• glassy membrane
• epithelial root sheath

Question 23

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

Answer 23

Dermis
Fibrous sheath

Question 24

Glassy membrane is . . .

Answer 24

Thickened basal lamina

Question 25

Epithelial root sheath is derived from . . .

Answer 25

Epidermis

Question 26

Hair matrix:

Answer 26

Actively dividing area of bulb that produces hair cells

Question 27

As matrix makes new cells it . . .

Answer 27

Pushes older ones upward

Question 28

Arrector pili:

Answer 28

Small band of smooth muscle attached to follicle

Question 29

Arrector pili are responsible for . . .

Answer 29

Goose bumps

Question 30

Hair papilla

Answer 30

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

Question 31

Vellus hair

Answer 31

Pale, fine body hair of children and adult females

Question 32

Terminal hair

Answer 32

Coarse, long hair

Question 33

Terminal hair is found on . . .

Answer 33

Scalp and eyebrows

Question 34

At puberty terminal hair appears in . . .

Answer 34

Axillary and pubic regions Face and neck of males

Question 35

_________ and __________ affect hair growth

Answer 35

Nutrition and hormones

Question 36

Follicles cycle between ________ and _________ phases

Answer 36

Active and regressive

Question 37

Average ___________ growth per week

Answer 37

2.25 mm

Question 38

Lose _____ scalp hairs daily

Answer 38

90

Question 39

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

Answer 39

Ovaries and adrenal Androgens

Question 40

Can result in excessive hairiness called . . .

Answer 40

Hirsutism

Question 41

Alopecia

Answer 41

Hair thinning in both sexes after age 40

Question 42

Baldness

Answer 42

Genetically determined and sex-influenced condition

Question 43

Male pattern baldness caused by . . .

Answer 43

Follicular response to DHT

Question 44

Telegenic effluvium is __________ caused by ________________

Answer 44

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

Question 45

Telegenic effluvium can be due to . . .

Answer 45

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

Question 46

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.

Answer 46

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

Question 47

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

Answer 47

d) Excessive secretion of androgens from an adrenal tumor