Across
- 3. groups of cells that have a similar structure and act together to perform a specific function
- 4. are extensions of the windpipe
- 7. system water in the body and filters and eliminates
- 9. is a wide, hollow tube
- 11. smallest of the body's blood vessels
- 12. pair of organs in the abdominal cavity of mammals, birds, and reptiles
- 14. tiny balloon-shaped air sacs
- 15. blood cell protecting the body against both infectious diseases
Down
- 1. a major part of the digestion of food occurs
- 2. contains many different types of cell
- 5. system network consisting of blood
- 6. Each of your kidneys is made up of
- 8. thin skeletal muscle that sits at the base of the chest
- 10. A chamber of the heart
- 13. help by increasing the surface area the intestine has for absorption.