Question

Activation of sympathetic Nervous system.
A. Decrease the blood pressure
B. Causes pupil contraction
C. Increases the heart rate
D. Causes bronchoconstriction

Answer 1

Sympathetic nervous system is part of the autonomic nervous system, which is an extensive network of neurons. It is responsible for the regulation of the body’s involuntary process. It prepares a person for a sudden emergency. It mainly gets activated during situations like threat, attack or something that you are anxious about.

Complete answer:
The sympathetic nervous system prepares the body for the ‘fight or flight’ response during any emergency. The sympathetic nervous system operates through a series of interconnected neurons. The sympathetic nervous system stimulates the adrenal gland by releasing catecholamine, which include adrenaline and noradrenaline.

The ‘fight or flight response’ may occur during any danger or emergency. Some of the physical signs that appear during emergency are:-
(i) Rapid heartbeat and breathing.
(ii) Pale or flushed skin.
(iii) Dilated Pupils.
(iv) Trembling.
It plays a critical role in dealing with stress and danger in the environment.

Hence, the correct answer is option (C).

Note: The response prepares the body to fight or fire the threat. But, it is triggered due to both real and imaginary threats. In response to acute stress, the body’s sympathetic nervous system is activated due to the sudden release of hormones. This results in increased heart rate, BP and breathing rate. The body returns to its normal state after 20 to 60 minutes.
The parasympathetic nervous system is also a part of the autonomic nervous system that helps to calm down the body. It decreases the respiration rate and the heart rate while increasing the digestion process.