Which organ's functioning unit is the nephron?

• A. Liver
• B. Heart
• C. Kidney
• D. Lung

Answer: (C)

The nephron is recognized as the fundamental functional unit of the kidney, which is primarily responsible for filtering blood and producing urine. Each kidney contains approximately one million nephrons, which play a crucial role in the regulation of water, electrolytes, and waste products in the body. The nephron's structure includes key components such as the glomerulus, which filters blood, and the renal tubules, which reabsorb necessary substances and excrete waste.

In contrast, the liver primarily involves functions such as detoxification, protein synthesis, and the production of biochemicals necessary for digestion, but it does not utilize nephrons. The heart's functionality revolves around pumping blood throughout the body and does not involve nephron units. The lungs are responsible for gas exchange and respiratory functions, also lacking nephrons. Understanding the specific role of the nephron in the kidney is essential for grasping how renal physiology impacts overall body function.