Components of blood have distinct roles in transport and defense.
Complete the table by giving the missing information.
| Component | Function |
|---|---|
| Transports digested food, heat energy, and urea | |
| Phagocytes | |
| Contain haemoglobin to bind and transport oxygen | |
| Lymphocytes |
Vaccination introduces an inactive form of a pathogen to stimulate the production of memory cells.
Explain how these memory cells protect an individual from developing disease symptoms if they are later exposed to the live pathogen.
