The functions of the nephron include all of the following except _______.

• A. secretion of waste products into the urine
• B. reabsorption of water and solutes
• C. production of bile
• D. filtration of blood

Answer: (C)

Verified step by step guidance

1. Step 1: Begin by understanding the primary functions of the nephron, which is the functional unit of the kidney. The nephron is responsible for processes such as filtration, reabsorption, secretion, and excretion to maintain homeostasis.
2. Step 2: Review the process of filtration. Blood enters the nephron through the glomerulus, where filtration occurs. This process removes waste products, excess ions, and water from the blood, forming the initial filtrate.
3. Step 3: Examine the process of reabsorption. As the filtrate moves through the nephron tubules, essential substances like water, glucose, and ions are reabsorbed back into the bloodstream to prevent their loss.
4. Step 4: Understand secretion. The nephron actively secretes waste products, toxins, and excess ions into the filtrate, which eventually becomes urine.
5. Step 5: Clarify that bile production is not a function of the nephron. Bile is produced by the liver and stored in the gallbladder, playing a role in digestion, not in kidney function.