Across
- 4. blood contains an iron-containing red pigment called _____
- 7. when cellular respiration uses oxygen it is called ____
- 9. Gas exchange in the lungs happens in the____
- 10. Pair of spongy organs protected by Ribcage
Down
- 1. Trachea divides into 2 tubes called ____
- 2. prevents the food from entering the windpipe
- 3. muscles that help in the movement of the rib cage on inhalation and exhalation.
- 5. another word for the windpipe
- 6. muscle that supports the lungs
- 8. common passage for food and air