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Which component of the heart is responsible for initiating the heartbeat?

Practice Questions

Q1
Which component of the heart is responsible for initiating the heartbeat?
  1. Atrioventricular node
  2. Sinoatrial node
  3. Bundle of His
  4. Purkinje fibers

Questions & Step-by-Step Solutions

Which component of the heart is responsible for initiating the heartbeat?
  • Step 1: Understand that the heart has different parts that work together.
  • Step 2: Learn that the sinoatrial node (SA node) is a special group of cells in the heart.
  • Step 3: Know that the SA node is located in the right atrium of the heart.
  • Step 4: Realize that the SA node generates electrical impulses.
  • Step 5: Understand that these electrical impulses cause the heart to contract and pump blood.
  • Step 6: Conclude that the SA node is the component responsible for starting the heartbeat.
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