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Which structure in the heart initiates the electrical impulse for contraction?

Practice Questions

Q1
Which structure in the heart initiates the electrical impulse for contraction?
  1. Atrioventricular node
  2. Sinoatrial node
  3. Bundle of His
  4. Purkinje fibers

Questions & Step-by-Step Solutions

Which structure in the heart initiates the electrical impulse for contraction?
  • Step 1: Understand that the heart has a special structure that controls its beating.
  • Step 2: Identify that this structure is called the sinoatrial (SA) node.
  • Step 3: Know that the SA node is located in the right atrium of the heart.
  • Step 4: Learn that the SA node generates electrical impulses.
  • Step 5: Recognize that these impulses cause the heart muscles to contract and pump blood.
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