Question

Place the events of B cell activation in order ______. - B cell engulfs antigen and presents it to a T helper cell - Activated helper T cell release IL-4 - B cell binds free antigen - B cell proliferates

Answer 1

B cell activation involves a B cell binding an antigen, presenting it to a T helper cell, followed by the release of cytokines from the T helper cell which signal the B cell to proliferate into plasma cells and memory B cells.

Step-by-step explanation:

The process of B cell activation is a crucial part of the immune response to pathogens. To place the events in order:

1. B cell binds free antigen.
2. B cell engulfs antigen and presents it to a T helper cell.
3. Activated helper T cell release IL-4.
4. B cell proliferates.

This sequence of events starts with the recognition and binding of the antigen by the B cell, followed by engulfing the antigen and presenting peptide fragments on its MHC II to T helper cells. The T helper cells then become activated and release cytokines like IL-4, which signal the B cell to proliferate and differentiate into plasma cells that produce antibodies and memory B cells that aid in long-lasting immunity.