Question

Assertion (A): The sympathetic nervous system is stimulated by the hormone thyroxine which is secreted by the thyroid gland.

Reason (R): Sympathetic nervous system prepares the body for violent action against abnormal conditions. Adrenaline is termed as emergency hormone.

1. A is True and R is False.
2. A is False and R is True.
3. Both A and R are True.
4. Both A and R are False.

विकल्प

• (1)

• (2)

• (3)

• (4)

Answer 1

(2)

Explanation:

The sympathetic nervous system is mainly associated with adrenaline, not thyroxine. The adrenal glands secrete adrenaline, which prepares the body for stressful or emergency situations. Therefore, the Assertion (A) is false.

The sympathetic nervous system prepares the body for fight-or-flight responses during abnormal or stressful conditions. Adrenaline is called the emergency hormone because it increases heart rate, breathing rate, and blood supply to muscles. Therefore, the Reason (R) is true.

Hence, A is false and R is true.