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Type: Multiple-Choice
Category: Circulatory and Immune Systems
Level: College
Author: Quayd
Last Modified: 8 years ago

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Circulatory and Immune Systems Question

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College Circulatory and Immune Systems

When do the atria contract?
  1. The first heart sound
  2. the second heart sound
  3. the QRS complex
  4. the PQ segment
  5. The ST segment