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Question
In heart cells, which one a second messenger that speeds up muscle contraction in response to adrenaline
In heart cells, which one a second messenger that speeds up muscle contraction in response to adrenaline
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Solution
The correct option is A cAMP
Adrenaline binds to its receptors present on the cell surface i.e. plasma membrane. In heart muscles, cAMP (cyclic adenosine monophosphate) acts as a second messenger. It increases muscle contraction in response to adrenaline which is a neurotransmitter secreted from adrenal medulla. cGMP (cyclic guanosine monophosphate) also acts as a second messenger but it decreases muscle contraction in response to acetylcholine.So, the correct answer is 'cAMP'.
Adrenaline binds to its receptors present on the cell surface i.e. plasma membrane. In heart muscles, cAMP (cyclic adenosine monophosphate) acts as a second messenger. It increases muscle contraction in response to adrenaline which is a neurotransmitter secreted from adrenal medulla. cGMP (cyclic guanosine monophosphate) also acts as a second messenger but it decreases muscle contraction in response to acetylcholine.
So, the correct answer is 'cAMP'.
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