Name the hormone secreted by adrenal cortex which controls water and salt concentration in urine, 

Options

A. Adrenaline
B. Aldosterone
C. Norepinephrine
D. Corticosterone

Answer

**Step-by-Step Solution:**

1. **Identify the Gland**: The question asks for a hormone secreted by the adrenal cortex. The adrenal gland consists of two main parts: the adrenal cortex and the adrenal medulla.

2. **Focus on the Adrenal Cortex**: The adrenal cortex is further divided into three zones: zona glomerulosa, zona fasciculata, and zona reticularis. The hormone in question is secreted from the zona glomerulosa.

3. **Determine the Type of Hormone**: The hormone secreted by the zona glomerulosa is classified as a mineralocorticoid. Mineralocorticoids are hormones that help regulate the balance of minerals, particularly sodium and potassium, in the body.

4. **Identify the Specific Hormone**: The primary mineralocorticoid produced by the adrenal cortex is aldosterone.

5. **Understand the Function of Aldosterone**: Aldosterone plays a crucial role in controlling water and salt concentration in urine. It promotes the reabsorption of sodium (Na+) in the kidneys, which leads to water retention. It also promotes the excretion of potassium (K+).

6. **Conclusion**: Therefore, the hormone secreted by the adrenal cortex that controls water and salt concentration in urine is **aldosterone**.

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