Respiratory System
Across
- 4. A word that means 'to do with the lungs'
- 6. A flap of skin that prevents food from entering the windpipe.
- 7. Tiny veins that allow for gas exchange
Down
- 1. A simple sugar that cells use as fuel.
- 2. A tiny cluster-like structure covered in capillaries
- 3. The release of energy from food.
- 5. A muscle that controls the volume of the lungs.