Question
Biology Question on chemical coordination and integration
Which one of the following is not a secondary messenger in hormone action?
A
cAMP
B
cGMP
C
calcium
D
sodium
Answer
sodium
Explanation
Solution
Secondary messengers are low-weight diffusible molecules that are used to relay signals within a cell. They are synthesized or released by specific enzymatic reactions, usually as a result of an external signal that is received by a transmembrane receptor. cAMP, cGMP and Ca act as secondary messengers and are located within the cytoplasm. Sodium is an essential nutrient which helps to maintain blood volume and keeps nerves functioning.