Question
Which one of the following is not a second messenger in hormone action?
Calcium
Sodium
cAMP
cGMP
Solution
B.
Sodium
Secondary messengers are molecules that relay signals received at receptors on the cell surface such as the arrival of protein hormones, growth factors, etc to target molecules in the cytosol and/ or nucleus. Ca+, cAMP and cGMP are secondary messenger in hormone action.
