Question

Assertion: Effect of sympathetic nervous system is excitatory in order to meet an emergency.
Reason: Sympathetic nervous system is a division of the autonomic nervous system.

• A. Both the assertion and reason are true and the reason is the correct explanation for the assertion
• B. Both the assertion and reason are true but the reason is not the correct explanation for the assertion
• C. Assertion is true but the reason is false
• D. Reason is true but the assertion is false

Answer 1

The correct option is A Both the assertion and reason are true and the reason is the correct explanation for the assertion

Sympathetic nervous system is a division of the autonomic nervous system. It is also called thoracic-lumbar outflow as it is connected with thoracic and lumbar parts of spinal cord. Effect of this nervous system is excitatory in order to meet an emergency. Various functions of sympathetic nervous system are:
- It increases heart beat and blood pressure.
- It activates the adrenal glands to meet an emergency.
- It reduces the secretion of saliva and digestive juices.
- It helps in relaxation of urinary bladder.
- It increases the secretion of sweat glands.
- It plays a major role in dilation of pupil.
- It temporarily decreases the peristalsis.
- It constricts peripheral blood vessels.