Outline4 marksStandard
The table below shows the concentration of a specific antibody in the blood of a rabbit following first and second exposure to an antigen.
| Day after first exposure | Antibody concentration (arbitrary units) |
|---|---|
| 0 | 0 |
| 5 | 2 |
| 10 | 50 |
| 14 | 100 |
| Day after second exposure (day 28 overall) | Antibody concentration (arbitrary units) |
|---|---|
| 0 | 10 |
| 2 | 200 |
| 4 | 500 |
| 7 | 500 |
Outline the roles of B-lymphocytes (including plasma cells), T-helper cells, and memory cells in producing the differences between the primary and secondary immune responses shown in the table.