What role do T cells play in the immune system?

T cells play a crucial role in the immune system by directly attacking body cells that have been infected by viruses. There are various types of T cells, but the most well-known are cytotoxic T cells (also known as CD8+ T cells). These cells recognize and bind to infected cells that present viral antigens on their surface. Once they identify these infected cells, cytotoxic T cells release perforin and granzymes, which lead to the destruction of the infected cells.

This function is particularly important because it helps to eradicate cells that have become factories for viruses, thus preventing the spread of infection within the body. Additionally, T cells also provide memory, which enables a faster and more robust response to subsequent infections by the same pathogen.

Contrastingly, the other choices involve different immune functions. Antibodies, produced by B cells, are responsible for neutralizing pathogens. Phagocytes, such as macrophages and neutrophils, are activated by signals from T cells but are not directly responsible for attacking infected cells. Lastly, while T cells can assist in defending against bacterial infections, this is not their primary role, especially when compared to their direct action on virus-infected cells. Therefore, the primary and most critical function of T cells