Crossword Puzzle

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Across
  1. 2. – Blood vessels that return blood to the heart.
  2. 5. – Another name for red blood cells.
  3. 8. – Tiny air sacs in the lungs where gas exchange occurs.
  4. 10. – Small branches of the bronchi leading to alveoli.
  5. 12. – The muscle that helps in breathing.
  6. 13. – The main artery carrying oxygenated blood from the heart.
  7. 14. – Gas essential for cellular respiration.
  8. 15. – The process by which gases move from high to low concentration.
Down
  1. 1. – Small blood vessels where oxygen and carbon dioxide are exchanged.
  2. 3. – The liquid component of blood.
  3. 4. – Blood vessels that carry blood away from the heart.
  4. 6. – Waste gas exhaled from the body.
  5. 7. – Related to the lungs.
  6. 9. – A chamber of the heart that pumps blood.
  7. 11. – A protein in red blood cells that carries oxygen.