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GATE BT 2023 | Question: 2

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Acetylcholine released by the parasympathetic nerves has which one of the following functions in the heart pacemaker cells?

  1. It binds to $\text{GPCR}$ and activates $\text{G}$ protein to slow the heart rate
  2. It stimulates $\text{GABA}$-activated ion-channel coupled receptor to increase the heart rate
  3. It binds to $\text{GPCR}$ and inhibits $\text{G}$ protein to slow the heart rate
  4. It inhibits $\text{GABA}$-activated ion-channel coupled receptor to increase the heart rate

 

 

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