Final answer:
T cells, specifically T4 helper cells, play an important role in the immune response by coordinating and directing other immune cells through the secretion of cytokines.
Step-by-step explanation:
T cells, specifically T4 helper cells, are an important component of our blood because they play a crucial role in the immune response. Helper T cells, identified by their expression of CD4 molecule, secrete cytokines that enhance other immune responses. They act as the 'managers' of the immune response by directing and activating other immune cells such as B cells and cytotoxic T cells.
For example, helper T cells release chemicals that 'switch on' B cells and cytotoxic T cells, allowing them to recognize and fight specific pathogens. They also release cytokines that help activate cytotoxic T cells. Helper T cells are crucial for coordinating and regulating the immune response to effectively eliminate pathogens and infected cells.