To label the structures and functions of the immune response in the figure, we can start by identifying the cells:
Structures:
a- Antigen;
b- immune cell - most cases naive B-cell;
c- immune cell - activated can be a B-cell or T-cell;
d- Epitopo of the antigen;
e- Antigen in direct contact with the immune cell
f- Immune cell in direct contact with the antigen;
g- Epitopo for antigen identification;
h- Immune cell - activated and that can determinated the antigen and kill it - T-cell (antibodies).
Functions:
a - pathogen, the cell responsible to cause the disease;
b - immune cell that identify the antigen;
c - immune cell that can act and find the antigen in the body;
d and g - proteic structure that act like an ID or presentation card for the cells;
e and f - the cellular contact with the pathogen;
h - cells that are responsible to deal with the pathogen and protect the body.