| A | B |
|---|
| Haemoglobin | Carries oxygen around the body |
| Plasma | Pale yellow liquid |
| Four | Number of components in blood |
| Red blood cells | These cells have no nucleus |
| Platelets | Tiny peices of cells with no nucleus |
| White cells | Defend the body against invading microbes |
| Urea | Transported by plasma |
| Hormones | Chemical messengers |
| Clot | Platelets help blood to do this |
| Fibrin | Forms a mesh that traps blood cells |
