The Respiratory System

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Across
  1. 1. It divides your lungs and your stomach
  2. 4. Alveoli are hemispherical vesicles composed of monolayer epithelial cells.
  3. 6. Also known as bronchial endings, tracheal twigs.
  4. 7. Humans need it to live
  5. 8. It's the primary bronchi from the trachea
Down
  1. 2. It's white. It's connected one by one
  2. 3. humans breathe through it
  3. 5. It's like ribs