Heart and Circulation

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

  • Double circulatory system
  • Closed circulatory system
  • Open circulatory System
  • Single circulatory system
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2. Which vessel has less collagen, elastic fibres and smooth muscle?

  • Vein
  • Artery

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

  • Atrioventricular valves
  • Semi lunar valves

4. Which vessel has a narrow lumen?

  • Artery
  • Vein

5. What is one reason why diffusion may be inadequate for some organisms to receive oxygen and get rid of waste substances?

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

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