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: The bladder stores urine, not expel the excess substances to form urine.
• Option C: The urethra is the tube through which urine is excreted from the body, not where urine is formed by expelling excess substances.
• Option D: The gallbladder stores bile (related to digestion), not involved in urine formation.

So the kidneys are where excess salts, water, and materials are expelled in urine.

Answer:

A. kidneys