Skin lecture 1

Question 1

what percentage of human body weight is skin?

Answer 1

16%

Question 2

functions of skin?

Answer 2

• protection via keratin production
• excretion (salt, water, organic waste)
• Vit D3 synthesis
• receptors
• lipid storage

Question 3

Cutaneous layers of the skin?

Answer 3

Epidermis

Dermis

Question 4

Layers of the epidermis, thick skin?

(superficial to deep)

Answer 4

stratum corneum 
stratum lucidum 
stratum granulosum 
stratum spinosum 
stratum basale

Question 5

3 layers of skin?

Answer 5

epidermis
dermis
hypodermis

Question 6

function of keratinocytes?

Answer 6

produce keratin to protect from abrasion

Question 7

how is the dermis connected to epidermis?

Answer 7

Desmosomes

Question 8

What makes up the dermis?

Answer 8

Dense irregular connective tissue
collagen and elastin
blood vessels, nerves, lymphatics

Question 9

Functions and features of subcutaneous hypodermis?

Answer 9

Loose connective adipose tissue
connects skin to the rest of the body
energy storage
large blood vessels and sensory receptors

Question 10

What happens to the skin during ageing?

Answer 10

drier epidermis
reduced blood supply
decreased perspiration
less invaginations at the epidermis/dermis border

Question 11

What is the surface area of skin?

Answer 11

1.5-2m2

Question 12

what tissue dominates in epidermis?

Answer 12

Epithelial - stratified squamous epithelium

Question 13

Thick skin vs thin skin?

Answer 13

Thick skin has a greater epidermal layer and no hair. mainly on palms and soles. Thin skin is everywhere else.