What Is the Correct Order for the Following Events That

question 28

Multiple Choice

What is the correct order for the following events that follow a nerve impulse along a sympathetic neuron to innervate the heart?
1) G protein activates adenylyl cyclase.
2) Neuron releases norepinephrine.
3) Cyclic AMP activates protein kinase.
4) Receptor activates G protein.
5) Protein kinase phosphorylates Ca²⁺ channels.
6) Receptors activated on the membrane of the cardiac muscle.

• A) 1, 3, 4, 5, 2, 6
• B) 5, 3, 4, 1, 2, 6
• C) 6, 2, 4, 1, 3, 5
• D) 2, 6, 4, 1, 3, 5
• E) 2, 3, 4, 1, 6, 5

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