Question

Osmoregulation is control over the

• A. pH of the blood and other tissues
• B. removal of nitrogen from the body
• C. osmotic properties of cell membranes
• D. concentrations of salt and water in the body

Answer 1

Answer: (D)

concentrations of salt and water in the body

Human beings maintain a fixed osmotic concentration in the body fluid despite changes in the external environment. In the case of human beings, the desiccation from outer surface is minimized by keratinized dead cell layers over the skin. Major loss of water is from the nose and respiratory surfaces during breathing. Water loss is compensated by drinking and eating most foods. In human beings, the kidneys play an important role in down-regulation.

So the correct option is concentration of salt and water in the body.