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Y is hormone which acts mainly at the r...

Y is hormone which acts mainly at the renal tubules and stimulates the absorption of `Na^(+)` and water and excretion of `K^(+)` and phosphate ions. Thus it helps in the maintenance of electrolytes body fluid volume , O-P and B.P. Y is

A

Aldosterone/mineralocorticoids

B

GH

C

GIP

D

ANF

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To solve the question regarding the hormone Y that acts mainly at the renal tubules, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Function of the Hormone**: The question states that hormone Y stimulates the absorption of sodium (Na^+) and water, while promoting the excretion of potassium (K^+) and phosphate ions. This indicates that the hormone plays a crucial role in regulating electrolyte balance and fluid volume in the body. **Hint**: Look for a hormone that is involved in sodium and water reabsorption and potassium excretion. 2. **Determine the Location of Action**: The hormone acts mainly at the renal tubules, which are part of the nephron in the kidneys. This suggests that the hormone is involved in kidney function. **Hint**: Consider hormones that specifically target the kidneys. 3. **Recall Hormones Involved in Renal Function**: The primary hormones that regulate kidney function include aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP). Among these, aldosterone is known for its role in sodium reabsorption and potassium excretion. **Hint**: Focus on the mineralocorticoids, particularly aldosterone, when thinking about sodium and potassium regulation. 4. **Confirm the Role of Aldosterone**: Aldosterone is a mineralocorticoid hormone secreted by the adrenal cortex. It promotes the reabsorption of sodium and water in the renal tubules and facilitates the excretion of potassium and phosphate ions. This aligns perfectly with the functions described for hormone Y. **Hint**: Verify the specific actions of aldosterone in the context of renal physiology. 5. **Conclude the Answer**: Based on the functions and the location of action, we can conclude that hormone Y is aldosterone. **Hint**: Ensure that the conclusion matches all the functions outlined in the question. ### Final Answer: Y is aldosterone.
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