lect 4-skin

Question 1

what is the largest organ of the body

Answer 1

skin

Question 2

what are the layers of the epidermis

Answer 2

corneum, lucidum, granulosum, spinosum, basale

Question 3

where are the stem cells located in the skin

Answer 3

stratum basale level

Question 4

what type of cells are in the stratum basale

Answer 4

small cuboidal/low columnar

Question 5

what layer of the skin are langerhans cells found

Answer 5

stratum basale

Question 6

how are cells attached to neighbors in these stratum spinosum

Answer 6

via desmosomes

Question 7

what is the most superficial nonkeratinized layer

Answer 7

stratum granulosum

Question 8

what level of cells display apoptosis

Answer 8

stratum granulosum

Question 9

what layer is only found in thick skin

Answer 9

stratum lucidum

Question 10

what layer of skin has no cellular organelles

Answer 10

stratum corneum

Question 11

what cell participates in the formation of the epidermal water barrier

Answer 11

keratinocytes

Question 12

what are melanocytes derived from

Answer 12

neural crest

Question 13

where are melanocytes found

Answer 13

stratum basale

Question 14

what layer are merkel cells found in

Answer 14

stratum basale

Question 15

where do langerhans cells originate

Answer 15

bone marrow

Question 16

where are langerhan;s cells found

Answer 16

stratum spinosum

Question 17

what are free nerve endings sensitive to

Answer 17

pain, temperature, crude touch

Question 18

what are meissner’s corpuscles sensitive to

Answer 18

touch, pressure

Question 19

wat are merkel’s discs sensitive to

Answer 19

touch, pressure

Question 20

what are ruffini’s corpuscles sensitive to

Answer 20

stretching of skin

Question 21

what are pacinian corpuscles sensitive to

Answer 21

deep pressure, vibration

Question 22

what do first degree burns include

Answer 22

only the outer layer of skin (epidermis)

Question 23

what do second degree burns include

Answer 23

involve entire epidermis and upper layers of dermis

Question 24

what do third degree burns involve

Answer 24

destruction of entire epidermis and most of dermis (sensation may be present or deminished)

Question 25

what level of burn is highly likely to result in scarring and skin grafting

Answer 25

3rd degree

Question 26

what type of gland is involved in the formation of acne

Answer 26

apocrine

Question 27

what type of cell rapidly proliferates in psoriasis

Answer 27

keratinocytes