Respiratory & Circulatory System

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Across
  1. 1. _____ blood cells help the body fight off germs
  2. 3. Chronic Obstructive Pulmonary Disease
  3. 6. hardening of arteries
  4. 8. it contracts and flattens out and pull downwards when breathing
  5. 9. gives color to the blood
  6. 12. the trachea is the main ____ to the lungs
  7. 13. your heart is about the size of your ____
Down
  1. 1. the trachea is also knows the the _______
  2. 2. gas our body emits
  3. 4. the liquid part of the blood
  4. 5. the main organ of the respiratory system
  5. 6. tiny sacs in the lungs where gas exchange takes place
  6. 7. the plasma is made in the _____
  7. 10. organ essential to human speech
  8. 11. tiny hairs in the nostrils