Which one of the following is an emergency hormone
Or
When an animal is angry and wants to fight, the hormone that is secreted is
(a) Aldosterone
(b) Calcitonin
(c) Thyroxine
(d) Adrenaline

Options

A. Aldosterone
B. Calcitonin
C. Thyroxine
D. Adrenaline

Answer

To solve the question regarding which hormone is considered an emergency hormone or is secreted when an animal is angry and wants to fight, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for an emergency hormone that is secreted when an animal is angry and wants to fight.

2. **Identify the Options**: The options provided are:
- (a) Aldosterone
- (b) Calcitonin
- (c) Thyroxine
- (d) Adrenaline

3. **Analyze Each Option**:
- **Aldosterone**: This hormone is involved in regulating sodium and potassium levels in the body and is not associated with emergency responses.
- **Calcitonin**: This hormone helps regulate calcium levels in the blood but does not play a role in emergency situations.
- **Thyroxine**: This hormone regulates metabolism but is not related to immediate stress or emergency responses.
- **Adrenaline**: This hormone, also known as epinephrine, is produced by the adrenal glands and is known as the "fight-or-flight" hormone. It is secreted in response to stress, anger, or danger, preparing the body for a quick response.

4. **Select the Correct Answer**: Based on the analysis, adrenaline is the hormone that fits the description of an emergency hormone and is secreted when an animal is angry and wants to fight.

5. **Conclusion**: Therefore, the correct answer is (d) Adrenaline.

### Final Answer:
(d) Adrenaline