Lesson 3 - Your Heart and Lungs

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 3. Gas in the air that we need to breathe (6)
  2. 4. The arrangement of the body and its limbs (7)
  3. 6. The organ of smell and entrance to the respiratory tract (4)
  4. 9. An alkaloid poison that occurs in tobacco (8)
  5. 10. Either of two saclike respiratory organs in the chest of vertebrates (plural) (5)
  6. 12. Of or relating to ___ (11)
  7. 14. A heavy odorless colorless gas formed during respiration and by the decomposition of organic (13)
  8. 15. Organ that pumps blood around the body (5)

Down

  1. 1. Physical activity that keeps you fit (8)
  2. 2. Red liquid pumped around the body by the heart (5)
  3. 5. Pertaining to ___ (11)
  4. 7. A blood vessel that carries blood from the heart to the body (6)
  5. 8. Membranous tube with cartilaginous rings that conveys inhaled air from the larynx to the bronchi (8)
  6. 11. The passage to the stomach and lungs (6)
  7. 13. A blood vessel that carries blood from the capillaries toward the heart (4)