Exam 3 cross word

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Across
  1. 1. — Bony structure protecting the thoracic cavity
  2. 6. — Exchange vessels for gas and nutrients
  3. 9. — Functional unit of the vertebral column
  4. 12. — Functional unit of skeletal muscle
  5. 13. — Countercurrent system maximizes O₂ uptake in fish
  6. 15. — Valve between atrium and ventricle
Down
  1. 1. — Vertebrate class with hepatic piston ventilation
  2. 2. — Unidirectional airflow occurs in this group of animals
  3. 3. — Main muscle for breathing in mammals
  4. 4. — Single basal element in a monobasic limb
  5. 5. — Surface area increases here for diffusion in lungs
  6. 7. — Elastic connective tissue that connects muscle to bone
  7. 8. — Parallel muscle fiber arrangement allows this advantage
  8. 10. — Type of blood vessel that carries blood toward the heart
  9. 11. — Bone group forming the backbone
  10. 14. — Involuntary, striated muscle type