Module 3 - Integumentary System

Question 1

Epidermis

Answer 1

Most superficial layer of the skin

Composed of keratinized, stratified, squamous epithelium

Question 2

What are the layers of the skin

Answer 2

Stratum Corneum
Stratum Lucidum (only in thick 5 layer skin)
Stratum Granulosum
Stratum Spinosum
Stratum Basale

Question 3

Keratinocytes

Answer 3

The cells in all layers of the skin except the Stratum Basale
A cell that manufactures and stores the protein keratin

Question 4

Keratin

Answer 4

An intracellular fibrous protein that gives hair, nails, skin their hardness and water resistance.

Question 5

Stratum Basale

Answer 5

Deepest epidermal layer
Cells bond to the dermis via the basement membrane
Intertwining collagen fibers with dermis

Question 6

Dermal Papilla

Answer 6

Found in the superficial portion of the dermis
Finger like
Increase the strength of connection between the epidermis and dermis.

Question 7

Basal Cells

Answer 7

Primarily make up the stratum basale
Cuboidal shaped stem cell
Precursor of the keratinocytes of the epidermis

Question 8

Merkel Cell

Answer 8

A receptor
Found in Stratum Basale
Touch nerve sensors
Abundant in hands and feet.

Question 9

Melanocyte

Answer 9

Produce the pigment melanin
Gives hair and skin colour
Protects living cells of epidermis from UV

Question 10

Stratum Spinosum

Answer 10

Spiny in appearance

Protruding cell processes that join cells.

Question 11

Stratum Granulosum

Answer 11

Grainy appearance due to further changes in keratinocytes as they are pushed from spinosum

Question 12

Stratum Lucidum

Answer 12

Layer only found in thick skin with 5 layers - hands and feet.
Smooth translucent layer
Keratinocytes are dead and flattened now
Densely packed with eleidin

Question 13

Stratum Corneum

Answer 13

Most superficial layer
Usually 15-30 layers fo cells
Entire layer replaced in about 4 weeks.