Which of the following hormone increases the calcium level of blood ?

Options

A. Parathyroid hormone
B. Noradrenaline
C. Corticosteroids
D. Aldosterone

Answer

To determine which hormone increases the calcium level in the blood, we will analyze each of the given options step by step.

### Step 1: Identify the hormones listed in the options
The options provided are:
1. Parathyroid hormone
2. Noradrenaline
3. Corticosteroids
4. Aldosterone

### Step 2: Analyze each hormone's function
- **Parathyroid hormone (PTH)**: This hormone is secreted by the parathyroid glands. Its primary function is to regulate calcium levels in the blood. It increases blood calcium levels by stimulating the release of calcium from bones, increasing calcium absorption in the intestines, and promoting calcium reabsorption in the kidneys.

- **Noradrenaline**: This hormone is produced by the adrenal medulla and primarily functions to increase blood pressure and heart rate. It does not play a role in calcium regulation.

- **Corticosteroids**: These are a class of steroid hormones that are involved in various functions, including reducing inflammation and regulating metabolism. They do not specifically increase calcium levels in the blood.

- **Aldosterone**: This hormone is produced in the zona glomerulosa of the adrenal cortex and is primarily involved in regulating sodium and potassium levels, as well as blood pressure. It does not have a direct effect on calcium levels.

### Step 3: Conclusion
After analyzing the functions of each hormone, we can conclude that the hormone that increases the calcium level in the blood is **Parathyroid hormone (PTH)**.

### Final Answer
**Parathyroid hormone increases the calcium level of blood.**

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