Which one of the following is not a second messenger in hormone action?
(i) Regulates blood calcium levels
(ii) Decreases blood pressure
(iii) Pigmentation
(iv) Inhibits gastric secretion
Text Solution
Verified by ExpertsIn heart cells, AMP acts as secondary messenger which is made in the response of adrenaline and it stimulates 
ions to come out from the sarcoplasmic reticulum of muscle fibres which causes muscle contraction. cGMP (Cyclic Guanosine Monophosphate) which acts as secondary messenger works on the action of acetylcholine, increase in flow of 
into muscle fibres & hence causes muscle relaxation. There is no role of sodium in hormonal action.
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