Name an important glucocorticoid and what is its main function ?

Explanation

### Step-by-Step Solution:

1. **Identify the Class of Hormones**: The question asks for an important glucocorticoid. Glucocorticoids are a class of steroid hormones produced by the adrenal gland.

2. **Name an Important Glucocorticoid**: The most important glucocorticoid in humans is cortisol.

3. **State the Main Function of Cortisol**: Cortisol has several critical functions, but its main role is to regulate various bodily functions to maintain homeostasis. This includes:
- Supporting cardiovascular activity.
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