Unit 7 .1

Question 1

Annotate a diagram of the generalized
structure of the skin

Answer 1

Epidermis
- Dermis
- Fat
- Glands
- Hair follicles

Question 2

Describe the functions of the skin

Answer 2

1. Regulation of Body Temperature
   Evaporative cooling:
   - In hot weather, there is an increase in blood flow to the skin
   - There is an increase in sweat production by the sweat glands
   - Evaporation of sweat cools the skin which leads to a decrease in body temperature
   Insulation happens via the subcutaneous fat layer
2. Protection and Immunity
   - Protection of underlying tissues against impact, abrasion, fluid loss, and harmful
   chemicals
3. Sensation
   - Detection of touch, pressure, pain and temperature stimuli through nerve endings
   and receptors in the skin
4. Excretion
   - Excretion of salts, water, and organic waste are released
5. Synthesis of Vitamin D
   - When exposed to sunlight epidermal cells produce vitamin D
   - Vitamin D is important in the absorption of calcium which promotes bone growth
   and muscle contraction