A person entering an empty room suddenly fins a snake right in front on opening the door. Which one of the following is likely to happen in his neuro-hormonal control system

Options

A. Sympathetic nevous system is activated releasing epinephrin and norepinephrin from adrenal cortex
B. Sympathetic nervous system is activated releasing epinephrin and norepinehrin from adrenal medulla
C. Neurotransmitters diffuse repidly across the cleft and transmit a nerve impulse
D. Hypothalamus activates the parasympatheitc division of brain

Answer

### Step-by-Step Solution:

1. **Understanding the Scenario**: A person enters an empty room and suddenly sees a snake. This unexpected encounter is likely to trigger a strong emotional response, typically fear.

2. **Identifying the Nervous System Involved**: The nervous system responsible for the immediate response to fear or danger is the sympathetic nervous system. This system prepares the body for 'fight or flight' responses in emergency situations.

3. **Activation of the Sympathetic Nervous System**: Upon encountering the snake, the sympathetic nervous system is activated. This activation leads to a series of physiological changes in the body to prepare for a quick response.

4. **Role of the Adrenal Medulla**: The sympathetic nervous system stimulates the adrenal medulla (not the adrenal cortex) to release hormones. The primary hormones released are epinephrine (also known as adrenaline) and norepinephrine (noradrenaline).

5. **Physiological Responses**: The release of epinephrine and norepinephrine results in several physiological changes, including:
- Increased heart rate
- Elevated blood pressure
- Dilation of pupils
- Increased metabolic rate
These changes prepare the body to respond effectively to the perceived threat.

6. **Conclusion**: The correct answer to the question is that the sympathetic nervous system is activated, releasing epinephrine and norepinephrine from the adrenal medulla.

### Final Answer:
The correct option is: **Sympathetic nervous system is activated releasing epinephrine and norepinephrine from the adrenal medulla.**

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