Multicellular organisms have a transport system for nutrients and gases. In humans, this transport system involves the blood.
The table names some components of blood. Complete the table by giving the missing function or cell type for each component.
| Component of blood | Function | Cell type |
|---|---|---|
| red blood cell | (i) | red cell |
| platelet | helps blood clot / clotting | (ii) |
| lymphocyte | (iii) | (iv) |
Suggest the consequence to the body of having an abnormally low concentration of red blood cells.
After vaccination, the body produces memory cells. Explain how these memory cells provide rapid immunity if the same pathogen enters the body again.
