What is an important function of cell markers?

Cell markers, also known as cell surface markers or antigens, play a crucial role in the immune system by distinguishing between 'self' and 'non-self' cells. This function is essential for maintaining the body's defense mechanisms. The immune system relies on these markers to recognize cellular identity and to differentiate between the body's own cells (self) and foreign invaders such as pathogens, viruses, and cancer cells (non-self).

When the immune system encounters cells with unfamiliar markers, it can trigger an immune response to eliminate these non-self entities, effectively helping to protect the body from infections and diseases. This recognition process is critical in various physiological functions, including the activation of lymphocytes, the production of antibodies, and the coordination of immune responses.

While other functions mentioned, such as energy provision, hormone transport, and enzyme activity, are vital processes within cells, they do not pertain to cell markers' primary function in immunology. Therefore, understanding the role of cell markers in distinguishing self from non-self is essential for grasping how the immune system operates.