Skin Structure and Function 4 Flashcards Preview

2nd Year - Dermatology > Skin Structure and Function 4 > Flashcards

Flashcards in Skin Structure and Function 4 Deck (14):
1

6 Functions of the Skin?

Barrier function
Metabolism and detoxification
Thermoregulation
Immune defence
Communication (people see your skin)
Sensory Functions

2

Consequences of failure of barrier function of skin? (3)

Fluid loss = dehydration
Protein loss = hypoalbuminaemia
Infection

3

Consequence of failure of thermoregulation of skin?

Heath loss = hypothermia

4

Consequence of failure of metabolic processes of the skin?

Disordered thyroxine metabolism

5

Consequence of problem with sensory function of skin?

Pain

6

What does the skin act as a physical barrier to? (2)

Friction/ mechanical trauma
UV radiation

7

Why does UV burn when physical light doesn't?

The shorter the wavelength, the less it penetrates the skin but the more energy is attached to each proton - UV wavelength is shorter

8

What 2 products is the skin involved in the metabolism of?

Vitamin D
Thyroid hormone

9

Dietary sources of vitamin D?

Fish
Cheese
Egg yolks
Food fortified with vitamin D e.g. dairy products, orange juice, soy milk, cereals

10

What does vitamin D do?

Increases calcium absorption from the bowel
Promotes mineralisation of bone

11

Where does vitamin D from the diet and skin go?
What happens here?

Liver
Turned into 25 hydroxy-vitamin D

12

What happens to 25 hydroxy-vitamin D formed in the liver?

Made into active vitamin D (1, 25 dihydroxy-vitamin D3) in the kidney

13

What thyroid hormone is produced in the thyroid glands?
What happens to this?
Where does this occur?

Thyroxine (T4)
It must be converted into tri-iodothyronine (T3)
20% = thyroid gland
80% = peripheral (to thyroid) tissue including the skin

14

What in the skin senses temperature and controls sweating/ shivering/ blood supply?

warm/ cold sensitive thermoreceptors