Across
- 1. The first two branches of the trachea.
- 6. This contracts and moves down when we inhale, pulling air into the lungs.
- 8. Blood which which is returning to the lungs is low in oxygen, and is called ____________ blood.
- 9. Process which involves the exchange of gases between an organism and its surroundings by inhalation and exhalation.
- 12. A black sticky substance found in tobacco smoke which can damage the lungs.
- 13. Tiny air sacs in lungs surrounded by capillaries. They have thin walls and a large surface area for gas exchange.
- 14. The process whereby cells obtain energy from glucose, which requires oxygen and releases carbon dioxide and water as waste products.
Down
- 2. Name for any substance which can cause the growth of cancerous cells.
- 3. When blood contains a high concentration of oxygen it is called _______________ blood.
- 4. Gaseous product of cellular respiration.
- 5. By exercising regularly we can improve it, and it means our bodies won't get tired easily from physical activity.
- 7. Smaller tubes which branch off of the bronchi into the lungs.
- 10. Also known as the windpipe, it connects the mouth to the lungs.
- 11. Substance in tobacco smoke which is highly addictive