Across
- 3. diaphragm moves upwards
- 6. carry blood poor in oxygen
- 7. carry blood rich in oxygen
- 10. The skin acts as a ____________
- 11. is a pumping organ
- 12. system transports useful substances to all parts of our body
- 14. spread through food and water
- 15. viruses, bacteria, parasites and fungi
Down
- 1. the main air tube that connects the nose and the lungs
- 2. When the heart ___________, blood flows into the heart.
- 4. We feel a ___________ every time the heart contracts to pump.
- 5. harmful living things entering the body can cause ________
- 8. tiny living things that live in soil, water, animal and plants
- 9. tiny air sacs that look like bunches of grape
- 13. system goes through many changes during puberty