Question

Loop of Henle is found in

• A. Spleen
• B. Lung
• C. Kidney
• D. Gall bladder

Hint:

The loop of Henle is located in the kidney and plays a crucial role in urine concentration.

Answer 1

The Correct Option is C

Step 1: Understanding the loop of Henle.
The loop of Henle is a U-shaped part of the nephron in the kidney. It plays an essential role in the process of filtering and concentrating urine. The loop is responsible for creating a concentration gradient that helps in water reabsorption.
Step 2: Analyzing the options.
(A) Spleen: This is incorrect. The spleen is involved in filtering blood, not in the formation of urine.
(B) Lung: The lungs are involved in gas exchange, not in the process of filtration or excretion.
(C) Kidney: Correct — The loop of Henle is found in the kidney, which is involved in filtering blood and forming urine.
(D) Gall bladder: The gall bladder stores bile, not involved in the formation of urine.
Step 3: Conclusion.
The correct answer is (C) Kidney because the loop of Henle is part of the nephron in the kidney.

Answer 2

The Loop of Henle's job is to help concentrate urine by creating an osmotic gradient in the surrounding tissue, so identifying which organ actually performs urine concentration and filtration points to the right answer.

1. Spleen: The spleen's role is filtering blood to remove old or damaged red blood cells and supporting immune function, it plays no part in forming urine, so it cannot contain a nephron structure like the Loop of Henle.
2. Lung: The lung's function is gas exchange (oxygen in, carbon dioxide out) through alveoli, a completely different physiological process from filtering blood plasma into urine.
3. Kidney: The kidney's functional unit, the nephron, includes the glomerulus, proximal tubule, Loop of Henle, distal tubule, and collecting duct. The Loop of Henle specifically dips into the medulla and sets up the concentration gradient that allows the kidney to reabsorb water and produce concentrated urine, this function belongs only to the kidney.
4. Gall bladder: The gall bladder simply stores and concentrates bile produced by the liver for digestion of fats; it has no filtration or urine-related structures.

Matching the urine-concentration function to its organ identifies only one match.

Therefore, the correct answer is Kidney.