Across
- 3. bone marrow serves as an energy reserve.
- 4. contain the antigens of dead or weakened pathogens.
- 5. skeleton consist of the skull, ribs, spine, ans sternum.
- 6. hold the bones of a joint in place.
- 9. synthesize large amounts of hemoglobin, which carries oxygen.
- 10. provides structure and support, gives shape and structure to the body
- 12. requires a molecule of iron to complete its formation.
- 14. lower chamber of the heart.
- 15. help defend the body from disease.
- 16. upper chamber of the heart.
Down
- 1. vessels that carry blood away from the heart.
- 2. cell fragments involved with blood clotting.
- 7. defensive proteins that attack it during later infections.
- 8. store Calcium.
- 10. sends electrical impulses to atrioventricular node.
- 11. tissue characterized by cells that are embedded in matrix.
- 13. is the cause of AIDS.
- 17. cells are T and B cells that don´t respond the first time they are exposed to the pathogen but will recognize and attack it during later infections.