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6. Which of the following has a closed, single circulatory system?

  • Fish
  • Locust
  • Human

7. What would an ECG trace be used to find?

  • Whether part of the heart muscle is unhealthy
  • The blood pressure within the heart
  • The size of the heart muscle

8. How is tissue fluid formed?

  • The pressure of the blood becomes too high and small molecules are forced out
  • The pressure of the blood becomes too high and small molecules are forced out through gaps in the capillary wall
  • The pressure of the blood becomes too low and small molecules leak out through gaps in capillary walls
  • The pressure of the blood becomes too high and large molecules are forced out through gaps in the artery walls

9. Which part of the heart is called the pacemaker?

  • Sinoatrial node
  • Atrioventricular node
  • Vena cava
  • Purkyne tissue