In heart cells,which one serves as a second m | vedclass

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(A) Second messengers are signaling molecules that relay signals from receptors on the cell surface to target molecules inside the cell,thereby amplif

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$cAMP$

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(A) Second messengers are signaling molecules that relay signals from receptors on the cell surface to target molecules inside the cell,thereby amplifying the effect of the first messenger (hormone).$cAMP$ (Cyclic adenosine $3',5'$-monophosphate) is synthesized from $ATP$ by the enzyme adenylate cyclase. It acts as a second messenger for various physiological processes,including adrenaline-mediated glycogenolysis and the acceleration of heart muscle cell contraction.

In heart cells,which one serves as a second messenger speeding up muscle cell contraction in response to adrenaline?

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