Merlin is experiencing an increased heart rate as a result of increased noradrenaline. He takes a pill containing acetylcholine to decrease his heart rate. What mechanism involving these two neurotransmitters allows this to work?

Question

Accepted Answer

They each activate a different G protein which in turn acts on adenyl cyclase in the heart

Answer

Acetylcholine competes to bind to the same G protein as noradrenaline, thereby reducing the available receptors for noradrenaline to bind to

Answer

Acetylcholine binds to the G protein causing a conformational change that prevents noradrenaline from binding

Answer

Acetylcholine binds directly to noradrenaline meaning it cannot bind to further receptors

Answer

Both neurotransmitters act on the same G protein that have differing effects on adenyl cyclase in the heart

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Merlin is experiencing an increased heart rate as a result of increased noradren...

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