What is released by immune system cells in response to an antigen?

In response to an antigen, immune system cells release various substances, with cytokines being a primary example. Cytokines are signaling molecules that facilitate communication between cells during immune responses. They play a crucial role in modulating the activity of immune cells, guiding their functions, and orchestrating the overall immune response. The release of cytokines helps in recruiting other immune cells to the site of infection or injury, influencing inflammation, and regulating the balance between different immune responses.

Histamine is also released by certain immune cells, particularly mast cells, during allergic reactions and inflammation. However, it primarily functions in promoting vasodilation and increasing the permeability of blood vessels, which aids in the influx of immune cells to the site of an antigen. This specifically aligns with allergic responses or tissue injury rather than the broader immune response.

Antihistamine refers to substances that block histamine receptors and is used to counteract the effects of histamine, particularly in allergic reactions, rather than being released in response to antigens itself.

Secretion is a more general term that doesn’t specify the type of immune response or the specific materials involved, making it less accurate in this context.

Therefore, the accurate answer highlighting the important role in the immune response due to its function