Adjustments in sodium concentration occur at the ................. of the nephron. Reabsorption of sodium ions is controlled by the hormone ...... which is produced by the adrenal cortex.

Explanation

**Step-by-Step Solution:**

1. **Identify the location of sodium concentration adjustment in the nephron:**
- The nephron is the functional unit of the kidney, and it consists of several parts including the glomerulus, proximal convoluted tubule, loop of Henle, distal convoluted tubule, and collecting duct. The adjustment in sodium concentration primarily occurs in the distal convoluted tubule.

**Hint:** Think about the different parts of the nephron and where sodium reabsorption is most significant.

2. **Identify the hormone responsible for sodium reabsorption:**
...