Integumentary System

Question 1

Epidermis

Answer 1

outer layer of skin

Question 2

Stratum basale

Answer 2

deepest layer of epidermal cells closest to dermis

• Nourished by blood from dermis
• Cells divide & grow, move upward

Question 3

Stratum corneum

Answer 3

outer layer of keratinocytes on surface of skin

Question 4

Keratinization

Answer 4

cells fill w/ keratin protein

Question 5

Dead cells are _____

Answer 5

eventually shed

Question 6

Rate of cell division increases when _____

Answer 6

skin is rubbed/pressed regularly

Question 7

calluses

Answer 7

thickened areas of keratinized skin

Question 8

Melanocytes

Answer 8

a mature melanin-forming cell, typically in skin

Question 9

Melanin

Answer 9

pigment for skin color, absorbs UV radiation

Question 10

All people have ____ number of melanocytes

Answer 10

same

Question 11

Differences in skin tone are caused by?

Answer 11

1. Amount of melanin
2. Size of pigment granules
3. Distribution of pigment granules
4. Sunlight stimulates melanin production

Question 12

Dermis

Answer 12

inner layer

Question 13

Dermal papillae

Answer 13

uneven projections of dermis into epidermis

Question 14

Specific fingerprint pattern is determined when?

Answer 14

fetus presses against uterine wall

Question 15

Connective tissue layers (2)

Answer 15

1. Areolar tissue

2. Dense connective tissue

Question 16

Dense connective tissue

Answer 16

Tough collagen fibers & elastic fibers within gel-like ground substance

Question 17

Dermal blood vessels

Answer 17

• Supply nutrients to skin cells

- Regulate body temperature

Question 18

Dermal blood vessels dilate to ___

Answer 18

release heat (more blood flow to skin)

Question 19

Dermal blood vessels contract to ___

Answer 19

retain heat (less blood flow to skin)