Among the leading cause of death for young adults (25–44 years old), trailing only accidents are

Synovial fluid serves as a lubricant to prevent friction between two parts that move on each other such as in the case of and bones.

How can a person  best  reduce the risk of injuries on the road?  

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