respiratory system

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Across
  1. 4. what tissue seals off the trachea and prevent food from entering and can also breath out
  2. 5. where in the lungs located
  3. 6. what air way leads from larynx the bronchi
  4. 7. what is something human can not live without
Down
  1. 1. which two structure does the trachea lead to in the lungs
  2. 2. what are the tiny air sacs in the lungs called
  3. 3. what is the main part human breath from other than there mouth
  4. 5. dioxide we breath in oxygen and release