Question

why are some salts excreted?
a they are end products of metabolism
b to maintain proper salt concentration in the blood
c they are not excreted

Explanation:

• Option A: Metabolic end products are typically substances like urea, not salts in general, so A is incorrect.
• Option B: The body excretes excess salts to maintain osmotic balance and proper salt concentration (osmoregulation) in the blood and body fluids. This is a key part of homeostasis.
• Option C: Salts (like sodium, potassium salts) are excreted (e.g., via kidneys in urine), so C is incorrect.

Answer:

B. To maintain proper salt concentration in the blood