Question

Bharat woke up late in the morning and missed the school bus. 
This situation stimulated the nerves of the sympathetic system which resulted in: 

• A. Constriction of Coronary arteries
• B. Muscle relaxation
• C. Decrease in Respiration rate
• D. Bronchodilation

Hint:

The sympathetic nervous system triggers responses like increased heart rate, bronchodilation, and muscle contraction to prepare the body for stress or physical exertion.

Answer 1

The Correct Option is D

Step 1: Sympathetic Nervous System Response.
The sympathetic nervous system is activated during stressful or exciting situations, such as when someone wakes up late and experiences urgency. This leads to the "fight or flight" response, which prepares the body for quick action.
Step 2: Physiological Responses.
- Constriction of Coronary arteries (A): This is not a typical response of the sympathetic nervous system. It generally causes dilation of blood vessels to increase blood flow to muscles.
- Muscle relaxation (B): This is not a typical sympathetic response. Sympathetic stimulation generally causes muscle contraction and alertness, not relaxation.
- Decrease in Respiration rate (C): Sympathetic activation leads to an increase in respiration rate, not a decrease, to supply more oxygen to the muscles.
- Bronchodilation (D): This is the correct answer. Sympathetic activation causes bronchodilation, allowing more air to reach the lungs to increase oxygen supply during stressful situations.

Step 3: Conclusion.
Based on the "fight or flight" response, the sympathetic nervous system causes bronchodilation to increase airflow and prepare the body for quick physical action. Final Answer: (D) Bronchodilation.