Question

Assertion :Adrenal medullary hormones help in combating the stress condition. Reason: Both adrenaline and noradrenaline act on same organs and produce similar effects.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

The adrenal medulla secretes two hormones called adrenaline or epinephrine and noradrenaline or norepinephrine. Adrenaline and noradrenaline are rapidly secreted in response to the stress of any kind and during emergency situations and are thus called emergency hormones or hormones of Fight or Flight. These hormones increase alertness, pupillary dilation, piloerection(raising of hair), sweating, etc. Both the hormones increase the heartbeat, the strength of heart contraction and the rate of respiration. They also stimulate the breakdown of glycogen resulting in an increased concentration of glucose in the blood. In addition, they also stimulate the breakdown of lipids and proteins. Both the hormones act on the same organs and produce similar effects on them e.g., accelerated heartbeat, raise blood pressure, slow peristalsis, etc.

So the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.