Anatomy and Physiology Module 3

Question 1

epidermis

Answer 1

outer portion of the skin formed by epithelial tissue that is attached to the dermis

Question 2

dermis

Answer 2

dense irregular connective tissue that forms the deep layer of skin

Question 3

hypodermis

Answer 3

loose connective tissue underneath the dermis that connects the dermis to the muscle or bone

Question 4

epidermal layers

Answer 4

deep—>outside:
stratum basale
stratum spinosum
stratum granulosum
stratum lucidum
stratum corneum

Question 5

stratum basale

Answer 5

constantly undergoing mitosis; 1 cell thick

Question 6

stratum spinosum

Answer 6

include melanocytes; several layers thick

Question 7

stratum granulosum

Answer 7

progressive change in the skin cells; several layers thick

Question 8

stratum lucidum

Answer 8

dead cells; found in thicker parts of the skin

Question 9

stratum corneum

Answer 9

flake off eventually; 25-30 layers thick

Question 10

melanin

Answer 10

determines the color of hair by either eumelanin (brown/yellow) or pheomelanin (red)

Question 11

two sections of the hair

Answer 11

shaft and root

Question 12

hair is made of:

Answer 12

medulla, cortex, and cuticle

Question 13

two regions of the hair root sheath

Answer 13

internal epithelial root sheath and external epithelial root sheath

Question 14

lunula

Answer 14

little white crest that is thicker than the rest of the nail

Question 15

skin system

Answer 15

protects from UV, bacteria, thermo, and keeps fluids inside the body

Question 16

arrector pili

Answer 16

tiny muscles that attach to the hair follicle

Question 17

malignant melanoma

Answer 17

skin cancer that results from uncontrolled mitosis

Question 18

squamous cell carcinoma

Answer 18

uncontrolled mitosis of the stratum spinosum

Question 19

epidermal ridges

Answer 19

fingerprints! result from rows of dermal papillae

Question 20

desquamation

Answer 20

process where skin cells flake off the skin when they reach stratum corneum