Respiratory System

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Across
  1. 1. where oxygen, or air, enters your body
  2. 2. protects the lungs
  3. 5. large tube made of cartilage; also known as windpipe
  4. 7. the space where lungs are located
  5. 8. tiny sacs of air at the end of bronchioles
Down
  1. 1. the open space behind the nose where air passes through
  2. 3. small branches of bronchi that carry air
  3. 4. major air passage to the lungs
  4. 6. sheet of muscle that separates the thoracic cavity from the abdomen
  5. 9. organs that expand when filled with air