______________________ is primarily responsible for maintaining the balance of water in the body and is regulated by the kidney
a. Calcium
b. Phosphorus
c. Sodium
d. Potassium
c
Rationale: a. Calcium is found mainly in bone tissue and is responsible for structure of bone and teeth as well as other functions.
b. Phosphorus is an anion and does not regulate water.
c. Correct.
d. Potassium is necessary for the transmission and conduction of nerve impulses, maintenance of normal cardiac rhythms, and skeletal muscle contraction.
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Fill in the blank(s) with the appropriate word(s).