| Answer | Crossword Clue |
|---|---|
| RHFACTOR | Important blood substance. |
| SEROLINE | Blood substance. |
| RHFACTOR | Inherited blood substance |
| HISTAMINE | Substance that lowers blood pressure. |
| AORTA | Important blood vessel |
| AORTA | Important blood line |
| PLATELETS | Important parts of blood. |
| PLASMA | Important part of blood. |
