The part of the mammalian kidney that stores urine is the

Analyze the question: The question asks which structure "stores urine." The wording "part of the mammalian kidney" matters, because the bladder is not part of the kidney.

Explain the concept: The kidney has these main regions:

• Capsule: a tough outer covering that protects the kidney.
• Cortex: the outer region where filtration occurs (glomeruli and Bowman's capsules).
• Medulla: the inner region containing the loops of Henle and collecting ducts, which concentrate urine.
• Pelvis: a funnel-shaped cavity that collects urine from the collecting ducts and passes it into the ureter.

The bladder stores urine, but it is a separate organ. Urine reaches it through the ureter, and it is not inside the kidney.

Step-by-step solution:

1. Capsule: protective covering, so it does not store urine. ✗
2. Medulla: it concentrates urine and does not store it. ✗
3. Pelvis: it is the part of the kidney that collects and holds urine before it drains into the ureter. ✓
4. Bladder: it stores urine, but it is outside the kidney. ✗

Answer: The question asks for a part of the kidney, so the best answer is C. pelvis.

Tip: Remember the urine path as: Cortex → Medulla → Pelvis → Ureter → Bladder → Urethra. If a question says "part of the kidney," rule out the bladder, since it is a separate organ. Pelvis is the kidney's "collecting room."