Which structure acts as the pacemaker of the heart?

  1. Atrioventricular node
  2. Purkyne tissue
  3. Sinoatrial node
  4. Bundle of His
Answer

C) Sinoatrial node

The SAN initiates each heartbeat. AS & A Level Biology · Topic 8 Transport in Mammals · 8.3 The heart

Biology MCQ · More A Level Biology: Transport in mammals MCQs · Practise