B cells as Antigen Presenting Cells or APCs-Mechanism

Definition of APC: Any cell that can process and present antigenic peptides in association with class II MHC molecules and deliver a co-stimulatory signal necessary for T cell activation. This interaction enhances immune response.
B cell as Antigen presenting cell 
B cells as Antigen Presenting Cells or APCs

Step 1: B cell activation=Antigen binding to Naïve B cell receptor followed by Antigen degradation inside B cell
Step 2: B cell acts as antigen presenting cells (APCs). Degrades antigenic peptides are displayed on MHC Class II recetor.
-T cell receptor (TCR) of Th cell binds to MHC class II bound antigenic peptide
-TCR activates B cells by secreting chemokines such as interleukins
Step 3: Clonal selection and Differentiation: That activated B cell  divide continuously forming clone of B cells with that specificity
Late these B cells differentiate into Plasma cells and memory B cells
Watch this video for better concept clarity
Step 4: Plasma cells produce antibodies and are released into the blood stream that binds to the antigen and neutralize it. Thus preventing further infection
-Memory B cells produced are responsible for immunologic memory. (when the same antigen attacks the body for the second time, memory B cells recognizes it quickly and trigger an enhanced immune response, thus preventing further infection).

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