Epinephrine and norepinephrine together known as :

Options

A. Steroid
B. Protein
C. Catecholamine
D. None

Answer

### Step-by-Step Solution

1. **Identify the Hormones**: The question asks about epinephrine and norepinephrine, which are hormones produced by the adrenal glands.

2. **Understand the Source**: These hormones are secreted from the adrenal medulla, which is the inner part of the adrenal glands.

3. **Recognize Their Function**: Epinephrine and norepinephrine are often referred to as "emergency hormones" because they are released in response to stress or danger, preparing the body for a "fight or flight" response.

4. **Classify the Hormones**: In terms of chemical classification, epinephrine and norepinephrine are not steroids or proteins. They belong to a specific category of hormones.

5. **Identify the Correct Term**: The correct term for epinephrine and norepinephrine together is "catecholamines." This term encompasses both of these hormones due to their similar structure and function.

6. **Conclusion**: Therefore, the answer to the question is that epinephrine and norepinephrine are collectively known as catecholamines.

### Final Answer
Epinephrine and norepinephrine together are known as catecholamines.

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