Question

Assertion (A) Our body secretes adrenaline in intense cold.
Reason (R) Adrenaline raises metabolic rate

• A. If both A and R are true and R is the correct explanation of A
• B. If both A and R are true and R is not the correct explanation of A
• C. If A is true, but R is false
• D. If A is false, but R is true

Answer 1

Answer: (A)

Adrenaline or epinephrine is secreted from adrenal medulla in response to stress conditions whenever homeostasis of body is disturbed, for example, in intense cold. Hence, assertion is correct. Adrenaline induces fight or flight reactions in the body. It increases alertness, heartbeat, strength of heart contraction, metabolic rate and rate of respiration. Hence, reason is also true and correct explanation for assertion. So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.