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Assertion (A): Erythropoietin is a steroid hormone which increases the production of RBCs.

Reason (R): Vasopressin is a peptide hormone, stimulates growth and protein synthesis.

Select the most appropriate answer from the options given below:

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not the correct explanation of A.

(c) A is true but R is false.

(d) if both A and R are false.

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Best answer

Correct option is (b)

Explanation of 'A' & 'R' :- Epinephrine is called as emergency hormone. It is secreted at the time of emergency. Stimulation of the sympathetic nerves to adrenal medulla causes large quantities of epinephrine (adrenaline) and norepinephrine (noradrenaline) to be released into the blood circulation. Both the hormones, epinephrine and norepinephrine increases alertness, pupillary dilation, piloerection (raising of hairs), sweating etc. Both hormones increase the heart beat, the strength of heart contraction and the rate of respiration. However, the effect caused by epinephrine has several times as great a metabolic effect as norepinephrine. Therefore, epinephrine is referred to as emergency hormone.

Result: Hence, it is proved that both 'A' and 'R' are true but as 'R' is not the correct explanation of 'A', so the answer is option (b).