1. Transfer of blood or blood components

2. Excessive bleeding

3. Determining the order of DNA bases

4. Study of blood

5. Clot formed within a blood vessel

6. Iron-containing protein in red blood cells

7. Shape of abnormal red blood cells in sickle cell anemia

8. Protein that fights against pathogens

9. Basic unit of life

10. Thin blood vessel for gas exchange

11. Condition of low red blood cell count

12. Another term for white blood cell

13. Color of blood cells

14. Microorganism that causes disease

15. Substance that triggers an immune response

16. Blood vessel that carries blood back to the heart