skin

Question 1

largest organ in the body

Answer 1

skin

Question 2

thickest skin

Answer 2

soles of the feet

Question 3

thinnest skin

Answer 3

upper and lower eyelids

Question 4

dark pigment that protects the epidermis from ultraviolet radiation

Answer 4

melanin

Question 5

sweat is produced by?

Answer 5

eccrine glands

Question 6

serves as personal identification; patterns assumed by ridges and intervening sulci

Answer 6

dermatoglyphics

Question 7

brownish black pigment

Answer 7

eumelanin

Question 8

similar pigment found in red hair

Answer 8

pheomelanin

Question 9

where is melanin synthesized?

Answer 9

tyrosine and cystine in the melanosomes

Question 10

congenital melanin disorder caused by defect in tyrosine

Answer 10

albinism

Question 11

skin pigmentation in affected patches due to decreased activity of melanocyte

Answer 11

vitiligo

Question 12

mediates and contacts allergic response in the skin and delayed hypersensitivity reaction

Answer 12

dendritic cells

Question 13

where are dendritic cells derived from?

Answer 13

bone marrow and blood borne cells

Question 14

responsible for sensory mechanoreceptor

Answer 14

merkel cells

Question 15

where are merkel cells derived?

Answer 15

neural crest cells

Question 16

most superficial layer of the epidermis

Answer 16

stratum corneum

Question 17

process of continuously shedding cells

Answer 17

desquamation

Question 18

only seen in thick skin; consists of thin translucent layer of extremely flattened eosinophilic cells

Answer 18

stratum lucidum

Question 19

3-5 layers of flattened polygonal cells undergoing terminal differentiation

Answer 19

stratum granulosum

Question 20

composed of stratum basale and stratum spinosum

Answer 20

malphigian layer

Question 21

deepest layer of epidermis; site of active mitosis and contains melanocytes

Answer 21

stratum basale

Question 22

tonic receptors for sustained light touch and for sensing an object’s texture

Answer 22

merkel cells

Question 23

responds to high and low temperatures, pain, and itching

Answer 23

free nerve endings

Question 24

web of sensory fibers surrounding the bases of hair follicles in the reticular dermis

Answer 24

root hair plexus

Question 25

initiate impulse when light-touch or low frequency stimuli against skin

Answer 25

meissner corpuscle

Question 26

found in penis and clitoris

Answer 26

krause end bulbs

Question 27

stimulated by stretch or twisting the skin

Answer 27

ruffini corpuscles

Question 28

second most common tumor arising on sun exposed skin

Answer 28

squamous cell carcinoma

Question 29

most common invasive cancer in human

Answer 29

basal cell carcinoma