Biology

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Across
  1. 4. vein carries blood from the lungs to left atrium of the heart
  2. 5. flap of tissue that ensures one way flow in a vessel
  3. 8. the smallest vessel of the circulatory system
  4. 10. the passage way through which air flows to alveolus
  5. 12. artery carries blood back to the heart from the right ventricle of the heart to the lungs
Down
  1. 1. connects the larynx to the lungs
  2. 2. cavity large air filled space cavity in and behind the nose
  3. 3. large artery that carries blood from the left ventricle of the heart out to the body
  4. 4. the portion of the throat posterior to the mouth and nasal cavity
  5. 6. any vessel that carries blood toward the heart
  6. 7. the liquid of nutrients, hormones, and gases that move through the circulatory system.
  7. 9. any vessel that carries blood away from the heart
  8. 11. capacity there amount of air that can fill the lungs
  9. 12. liquid portion of blood that holds blood cells in suspension
  10. 13. an organ used for the exchange of gases