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#Question id: 10984


Which of the following are caused by acetylcholine?

#SCPH28 | Zoology
  1. Hyperpolarization of the S-A node
  2. Depolarization of the A-V node
  3. Decreased permeability of the S-A node to potassium ions
  4. Increased heart rate

Answer:- Option(s): 1


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