Final answer:
TNFa is a cytokine that binds to specific receptors on the cell surface, initiating a cascade of events that result in the activation of various immune responses.
Step-by-step explanation:
TNFa is a cytokine that binds to specific receptors on the cell surface, initiating a cascade of events that result in the activation of various immune responses.
When TNFa binds to its receptor, it triggers intracellular signaling pathways that lead to the production and release of other cytokines, such as interleukins and interferons.
These cytokines then act as chemical messengers to communicate with other cells and coordinate the immune response.