Question

excess amounts of salts, water, and materials are expelled in the urine from the ______. a. kidneys b. bladder c. urethra d. gallbladder please select the best answer from the choices provided.

Explanation:

To solve this, we analyze each option:

• Option A: Kidneys filter blood to form urine by removing excess salts, water, and waste materials.
• Option B: Bladder stores urine, not expel the excess substances to form urine.
• Option C: Urethra is the tube through which urine is excreted from the body, not where urine is formed by expelling excess substances.
• Option D: Gallbladder stores bile, related to digestion, not urine formation.

So the kidneys are responsible for expelling excess salts, water, and materials in urine.

Answer:

A. kidneys