Respiratory system crossword

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Across
  1. 2. a word meaning to breathe out
  2. 3. our body needs this from the air in order to survive
  3. 6. the name of the system we use to breathe in air.
  4. 7. when we breathe in, air can enter our body through this starting with “n”
Down
  1. 1. the gas which you breathe out
  2. 4. a warm meaning “to breath in”
  3. 5. when we breathe in air king and there are bodies through this and starting with M