Hormone controlling `Na^(+)-K^(+)` ion concentration is

Options

A. Aldosterone
B. Anti-diuretic hormone
C. Progesterone
D. Pitocin.

Answer

To determine the hormone that controls the sodium (Na⁺) and potassium (K⁺) ion concentration in the body, we can follow these steps:

### Step 1: Identify the Options
The question provides four options:
1. Aldosterone
2. ADH (Antidiuretic Hormone)
3. Progesterone
4. Potassium

### Step 2: Analyze Each Option
- **Aldosterone**: This is a mineralocorticoid hormone secreted by the adrenal cortex. It plays a crucial role in regulating electrolyte balance, particularly by promoting the reabsorption of sodium ions in the kidneys and reducing sodium loss through urine and sweat. This directly influences the concentration of sodium and potassium ions in the body.

- **ADH (Antidiuretic Hormone)**: This hormone is secreted by the posterior pituitary gland and primarily functions to increase water reabsorption in the kidneys, which decreases urine production. While it affects fluid balance, it does not directly control sodium and potassium ion concentrations.

- **Progesterone**: This is a steroid hormone known as the female sex hormone, often referred to as the pregnancy hormone. It does not have a direct role in regulating sodium and potassium ion concentrations.

- **Potassium**: This is not a hormone but rather an essential mineral and electrolyte in the body. It does not control ion concentrations but is instead regulated by hormones.

### Step 3: Conclusion
Based on the analysis, the hormone that controls sodium and potassium ion concentration is **Aldosterone**. Therefore, the correct answer is **Option 1: Aldosterone**.