Across
- 1. The study of the structures of the body
- 2. changes that cause a response in the body
- 4. phase when the heart contracts
- 5. vessels that carry blood away from the heart
- 7. Two tubes that take air to the lungs
- 9. phase when the heart relaxes
- 10. White blood cells
- 13. air sacs in the lungs
- 14. the outermost layer of the heart
- 15. formed elements that aid in clotting
Down
- 1. Two upper chambers of the heart
- 3. the middle and thickest layer of the heart
- 6. The study of how various body systems work
- 8. A state of balance and stability in the body
- 11. Red blood cells
- 12. Blood vessels that carry blood toward the heart