6 Integument

Question 1

The epidermis is comprised of 4 types of cells. What are they and where are they found?

Answer 1

1. Keratinocytes - all layers of the epidermis
2. melanocytes - s. basale
3. langerhans cells - s. spinosom
4. merkel cells - s. basale

Question 2

what are the two types of epidermis

Answer 2

thick skin and thin skin

Question 3

which type of epidermis has hair follicles and nails

Answer 3

thin

Question 4

keratinocytes make lots of nonpolar ____ and ____ before flattening out and dying via _____

Answer 4

protein and lipid; apoptosis (controlled cellular death)

Question 5

explain stem cell replication

Answer 5

one daughter cells stays attached to the basement membrane to divide again. The othe daughter cells will be pushed outward and eventually become fully differentiated.

Question 6

what does melanin protect against?

Answer 6

UV light damage to DNA

Question 7

Where are melanocytes located and what do they send to the keratinocytes around them?

Answer 7

in the stem cell layer and send extensions (cell processes) to the keratinocytes

Question 8

melanocytes transfer ___ ___ to keratinocytes using membrane-bound packets called ___

Answer 8

melanin pigment to keratinocytes. Pockets called melanosomes.

Question 9

the stratum spinosum allows spaces between cells for ____ and ____ cells.

Answer 9

melanocytes and langerhans cells

Question 10

____ cells are defensive and form net-like arrays across body surfaces to intercept and ingest pathogens.

Answer 10

langerhans cells

Question 11

in the stratum granulsum cells make lots of ___ and ___ and undergo ___

Answer 11

proteins and lipids and undergo apoptosis

Question 12

the stratum corneum contains fully ___ keratinocytes

Answer 12

differentiated