Comparative Anatomy: Cardiovascular System

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Across
  1. 4. Muscle that aids breathing in mammals.
  2. 7. The largest artery, carrying blood from the heart to the body.
  3. 8. Organs for breathing air in reptiles, birds, mammals, and amphibians.
  4. 11. Pertaining to birds, which have unidirectional airflow in lungs.
  5. 13. Branches of the trachea that lead to the lungs.
  6. 15. Structure that prevents back-flow of blood in the heart.
  7. 16. Small openings on some arthropods and cartilaginous fish for air intake.
  8. 18. Wall that separates heart chambers.
  9. 19. Vertebrates with a single circulatory loop and two-chambered heart.
  10. 20. Tiny air sacs in mammalian lungs for gas exchange.
Down
  1. 1. Muscular organ that pumps blood through the circulatory system.
  2. 2. Oxygen-carrying protein in red blood cells.
  3. 3. Organs used for gas exchange in fish and some amphibians.
  4. 5. The fluid part of blood.
  5. 6. Heart chamber that pumps blood out to the body or lungs.
  6. 9. Microscopic vessels where oxygen and nutrients are exchanged.
  7. 10. Network of tubes used by insects to breathe.
  8. 12. External openings for air intake; also known as nostrils.
  9. 14. Common exit cavity for digestive, urinary, and reproductive systems in some animals.
  10. 17. Type of circulation with separate pulmonary and systemic loops.