Phys Ch 4 Vocab

Question 1

Organ

Answer 1

a group of tissue that performs a common function

Question 2

Organ System

Answer 2

a group of organs that perform a common function

Question 3

Keratinocyte

Answer 3

a cell that undergoes keratinization and produces keratin

Question 4

Keratinization

Answer 4

cells formed in the basal layers are pushed to the surface, the cytoplasm, nucleus, etc disappear, and they begin to accumulate keratin.

Question 5

Extensibility

Answer 5

ability to stretch

Question 6

Elasticity

Answer 6

ability to return to its original shape after being manipulated

Question 7

Striae

Answer 7

small tears in the skin marked by silvery white streaks

Question 8

Melanin

Answer 8

pigment of the epidermis

Question 9

Albinism

Answer 9

inability to produce color

Question 10

Malignant Melanoma

Answer 10

a serious skin cancer of the melanocytes from overexposure to UV radiation

Question 11

Hair Shaft

Answer 11

the superficial portion of hair

Question 12

Hair Root

Answer 12

portion that penetrates the dermis

Question 13

Hair Follicle

Answer 13

two layers of epidermal cells; one on the outside, one beneath it

Question 14

Arrector Pili

Answer 14

muscles to raise hair in fright or cold

Question 15

Nails

Answer 15

tightly packed, hard, keratinized cells

Question 16

Thermoreceptors

Answer 16

detect the stimulus and send nerve impulses to your brain

Question 17

Effectors

Answer 17

increase sweating and dilated blood vessels to release heat

Question 18

Merkel Cells

Answer 18

cells located in the deepest layer of skin that is hairless

Question 19

Dermis

Answer 19

composed of connective tissue containing collagen and elastic fibers

Question 20

Epidermis

Answer 20

attached to the inner, thicker connective tissue part called the dermis

Question 21

Subcutaneous Layer

Answer 21

which attaches the skin to the underlying structures

Question 22

Sebum

Answer 22

oil secreted by sebaceous glands