Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R).
Assertion (A): Epinephrine and norepinephrine are commonly called as catecholamines.
Reason (R): They increase the rate of heart beat and the rate of respiration.
In the light of the above statements, choose the most appropriate answer from the options given below.

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Both A & R are correct and R is the correct explanation of A.

A is not correct but R is correct.

Both A & R are correct but R is not the correct explanation of A.

A is correct but R is not correct.

answer is A.

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Detailed Solution

'A' is correct. Epinephrine and norepinephrine are commonly called catecholamens.

'R' is correct. When released in response to stress or a perceived threat, they stimulate the heart to beat faster (increasing heart rate) and increase the rate of respiration. These physiological responses help prepare the body for action in a stressful or emergency situation.

'R' does not explain 'A'. Epienphrine and norepinephrine are called catecholamines but because they increase heart rate and breathing rate but because they are amine hormones (derived from tyrosine) containing a catechol molecule, which consists of a benzene ring with two hydroxyl (OH) groups and a side chain.

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