Heart and Circulation

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1. The blood circulating in large open spaces describes what type of circulatory system?

  • Open circulatory System
  • Closed circulatory system
  • Single circulatory system
  • Double circulatory system
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2. What is one reason why diffusion may be inadequate for some organisms to receive oxygen and get rid of waste substances?

  • The organism is too large
  • The organism's surface is thin
  • The organism has a high surface area to volume ratio
  • The organism is unicellular

3. In which stage of the cardiac cycle does the ventricle contract?

  • Ventricular Systole
  • Diastole
  • Atrial Systole

4. What are the valves called between the atria and the ventricles?

  • Atrioventricular valves
  • Semi lunar valves

5. What are the valves called between the ventricles and the arteries?

  • Semi lunar valves
  • Atrioventricular valves

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