Acetylcholine retards the rate of heart beating by:

Circulatory System Physiology Mcqs
BILAL KHATTAK0

A.Decreasing the rate of initiation of heart beat in SA-Node
B.Decreasing the excitability of fibres of internodal pathway
C.Both (a) & (b)
D.None of these

Related Mcqs:

  1. Noradrenaline accelerates the beating of heart by:
  2. Role of pace-maker is:
  3. Nervous inervation of heart is primarily meant for:
  4. Heart beat in man is initiated by:
  5. The heart rate in man is increased by:
  6. On cutting off the parasympathetic supply to heart completely, the heart will:
  7. Heart shows rhythmic contractions and expansions withour pause and fatigue which may be defined as
  8. A decrease in the rate of beating of heart is called:
  9. Under which of these conditions, the heart rate is retarded by liberating acetylcholine:
  10. Which of these nerve fibres accelerate the rate of heart beat:

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