Carefully study the diagram below and answer the questions that follow. a. Label the structures A to F b. Name two structures that are concerned with temperature regulation in Man. c. State two functions of D d. State two functions of G. e. Where in Man is structure G thickest? f. What labelled part is involved in excretion by the skin?

a.  A - Free Nerve ending

B- Hair erector muscle

C- Capillary

D- Sebaceous Gland

E- Sweat Gand

F- Epidermis

b.  Two structures that are concerned with temperature regulation in Man are sweat glands and blood vessels. Sweat glands of the dermis, secrets sweat which then evaporate on the skin surface and maintain body temperature. constricted blood vessels retain the heat while dilated vessels allows heat loss.

c. Sebaceous gland is an exocrine gland that secret sebum having following functions:

d. G refers to stratum corneum, its functions are:

e. Stratum corneum is thickest in palms and soles in man.

f. Sweat glands are involved in the excretion by skin as they secret a fluid waste sweat and release it at skin surface.

1. is geographic distribution

2 is increasing complexity

3 is transitional forms