The hormone which reduces the sodium loss through urine and sweat is

Options

A. Calcitonin
B. Aldosterone
C. Parathormone
D. Vasopressin

Answer

To answer the question "The hormone which reduces the sodium loss through urine and sweat is:", we can follow these steps:

### Step 1: Identify the hormones involved in sodium regulation
- The body has several hormones that play a role in regulating sodium levels, including aldosterone, vasopressin (also known as antidiuretic hormone), and others.

### Step 2: Understand the function of aldosterone
- Aldosterone is a hormone secreted by the adrenal cortex, specifically from a region called the zona glomerulosa. Its primary function is to promote sodium reabsorption in the kidneys.

### Step 3: Explain the mechanism of action of aldosterone
- Aldosterone acts on the nephrons in the kidneys, particularly in the distal convoluted tubule and collecting ducts. It increases the reabsorption of sodium from the urine back into the bloodstream, which consequently reduces sodium loss through urine.

### Step 4: Discuss the effect of aldosterone on sweat
- In addition to its action in the kidneys, aldosterone also helps to reduce sodium loss through sweat, contributing to overall sodium retention in the body.

### Step 5: Compare with other hormones
- While vasopressin is involved in water retention and can influence blood pressure, it does not primarily focus on sodium retention like aldosterone does. Other hormones, such as calcitonin and parathyroid hormone, are more related to calcium metabolism rather than sodium.

### Conclusion
- Based on the functions and actions of these hormones, the correct answer to the question is **aldosterone**, as it specifically reduces sodium loss through urine and sweat.

### Final Answer
- The hormone which reduces the sodium loss through urine and sweat is **aldosterone**.

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