Atrial natriuretic hormone / factor (ANF) secreted by atrial wall of our heart has exactly the opposite function of this hormone secreted by zone glomeruosa -

Options

A. ADH
B. Aldosterone
C. Insulin
D. Calcitonin

Answer

### Step-by-Step Solution:

1. **Identify the Function of Atrial Natriuretic Hormone (ANF):**
- Atrial Natriuretic Hormone (ANF) is secreted by the atrial walls of the heart. Its primary function is to decrease blood pressure by promoting natriuresis, which is the excretion of sodium through urine.

2. **Determine the Opposite Function:**
- Since ANF decreases blood pressure, we need to identify a hormone that has the opposite effect, which is to increase blood pressure.

3. **Identify the Hormone Secreted by the Zona Glomerulosa:**
- The zona glomerulosa of the adrenal cortex secretes the hormone aldosterone. Aldosterone is known for its role in sodium reabsorption in the kidneys.

4. **Explain the Mechanism of Aldosterone:**
- Aldosterone promotes the reabsorption of sodium ions from the renal tubules back into the bloodstream. This sodium reabsorption leads to water retention, which increases blood volume and consequently raises blood pressure.

5. **Conclusion:**
- Therefore, the hormone that has the opposite function to Atrial Natriuretic Hormone (ANF) and is secreted by the zona glomerulosa is **Aldosterone**.

### Final Answer:
The hormone secreted by the zona glomerulosa that has the opposite function to Atrial Natriuretic Hormone (ANF) is **Aldosterone**.

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