Question

the amount of water in each compartment in the body mainly is controlled by __________ concentration.
multiple choice
ion
oxygen
glucose
fatty acid

Explanation:

The distribution of water in body compartments is regulated by osmosis. Ions (such as sodium, potassium) create osmotic gradients. Water moves to areas of higher ion concentration to balance osmotic pressure. Oxygen is for respiration, glucose for energy, and fatty acids for storage/energy - they don't primarily control water compartmental distribution.

Answer:

ion