What effect does exercise have on the nervous system? A. Prolonged exercise degenerates the nervous system.
B. Increased blood flow reduces nerve sensitivity.
C. Repetitive motion develops nerves and nerve endings.
D. Higher body temperature impairs nerve message transmissions.

Melanocytes and keratinocytes work together in protecting the skin from uv damage when keratinocytes a. provide the melanocyte with a protective shield against abrasion b. maintain the appropriate temperature so the product of the melanocyte will not denature c. maintain the appropriate ph in order for the melanocyte to synthesize melanin granules d. accumulate the melanin granules on their superficial portion, forming a uv-blocking pigment layer