Final answer:
Plasma cells are the cell type that secretes antibodies. They are derived from B cells and play a crucial role in the immune response by producing antibodies.
Step-by-step explanation:
The cell type that secretes antibodies is plasma cells. Plasma cells are derived from B cells, which are a type of white blood cell. B cells are responsible for producing antibodies, which are protein molecules that help defend the body against pathogens.