Across
- 2. The tube that carries air from the larynx toward the bronchi.
- 5. The two upper chambers of the heart that receive blood.
- 7. Tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged.
- 9. The gas that our cells need to help release energy from food.
Down
- 1. The two lower chambers of the heart that pump blood out.
- 3. The organ that pumps blood through the body.
- 4. A structure in the heart that helps blood move in one direction.
- 6. The fluid that transports oxygen, nutrients, and waste products around the body.
- 8. The organs where gas exchange takes place.