The main function of the cardiovascular systems is to
a. supply oxygenated blood to the various body organs.
b. facilitate nerve conduction.
c. coordinate body movement.
d. filter and eliminate waste products.

What is the main difference between trace elements and the main elements that make up the body? 1) main elements consist of heavier atoms. 2) trace elements are only needed in small amounts. 3) trace elements consist of heavier atoms. 4) main elements are only needed in small amounts.