Absorption of all occurs in PCT except

**Core Concept**
The Proximal Convoluted Tubule (PCT) is a crucial part of the nephron, where reabsorption of essential nutrients and ions occurs. It plays a vital role in maintaining electrolyte balance and fluid status in the body.

**Why the Correct Answer is Right**
The PCT is responsible for the reabsorption of glucose, amino acids, and sodium ions through specific transport mechanisms. Glucose is reabsorbed via the sodium-glucose cotransporter 2 (SGLT2), while amino acids are reabsorbed through specific amino acid transporters. Sodium ions are reabsorbed through the sodium-potassium pump and the sodium-chloride cotransporter. The PCT is also responsible for the reabsorption of bicarbonate ions, which helps maintain acid-base balance.

**Why Each Wrong Option is Incorrect**
**Option A:** Glucose reabsorption does indeed occur in the PCT, so this option is incorrect.
**Option B:** Similarly, amino acid reabsorption also occurs in the PCT, making this option incorrect.
**Option D:** Bicarbonate reabsorption also takes place in the PCT, so this option is incorrect.

**Clinical Pearl / High-Yield Fact**
The PCT is also responsible for the reabsorption of calcium ions, which is crucial for maintaining bone health and preventing hypocalcemia.

**Correct Answer: C.**