The human respiratory system

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Across
  1. 2. smaller tubes which allows air to reach deeper into the lungs
  2. 3. The part of the cell that causes gas exchange
  3. 4. Also known as a windpipe. It has strong rings of cartilage around it to keep it open and prevent it from collapsing.
  4. 6. the part connected to your trachea.
  5. 7. Tiny structures for gas exchange
Down
  1. 1. the big tube before branches into smaller one
  2. 5. respiration requires oxygen to release energy