Across
- 3. give red blood cells the bright red look
- 7. carries blood away from the heart
- 10. receive blood from the atria
- 12. carries blood towards the heart
- 13. recognize foreign antigens, and stimulate macrophages, B cells, and other T cells
- 15. joins each artery and vein
Down
- 1. a muscle that separates the atria and the ventricles
- 2. makes up 45% of red blood cells
- 4. activated by helper T cells or presence of a foreign antigen. Kill foreign cells by puncturing a hole in their membrane.
- 5. are produced in the thymus gland
- 6. create antibodies
- 8. filled with incoming blood
- 9. the liquid part of the blood
- 11. located in the middle of your chest and vital for circulation
- 14. breaks down quickly in the blood