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6. What are the names of the hearts four chambers?

  • Right atrium, right ventricle, left atrium, and left ventricle
  • Top atrium, top ventricle, bottom atrium and bottom ventricle

7. What happens when the atria contract?

  • The blood is pushed into the ventricles
  • The blood is pushed out of the heart

8. What happens when the ventricles contract?

  • The blood is forced into the pulmonary artery and the aorta and out of the heart
  • The blood is forced into the pulmonary artery and the aorta and into the heart

9. What are the walls of the heart mostly made of?

  • Capillaries
  • Muscle tissue
  • Veins