Mike,Julia

1. Match the following

a. Pacinian corpuscles 1. Light touch dermis (dynamic) b. Merkel’s discs 2. Pain and temperature c. Meissner’s corpuscles 3. Deep pressure d. Free nerve endings 4. Light touch static (epidermis)

a. 3, b. 4 , c. 1 , d. 2

2. What disease is the direct result of lack of vitamin D production in the epidermis? Name the disease and **__explain__** its effects.

When skin is exposed to ultraviolet light, a molecule of vitamin D is formed. Its carried by the blood to the liver, where it is modified, and then to the kidneys, where the precursor is modified further to form active vitimain D.

3. What are 3 accessory structures found in the dermis? a.sebaceous gland b.arrector pili c. hair follicle 4. Wrinkles a. Which over-stretched protein causes wrinkles?

b. Name 2 things that can cause wrinkles. loss of collagen many people have a genetic predisposition to severe wrinkling, it is known that sun exposure  promotes and exacerbates wrinkling of the skin. Smoking may also negatively affect the skin