Antigen presenting cells

Antigen presenting cells (APCs) are crucial components of the immune system. They capture and process foreign substances, like bacteria or viruses, and then present pieces of these antigens on their surface. This presentation helps activate T cells, which are essential for initiating immune responses. Think of APCs as the “messengers” that alert and inform T cells about threats, enabling the body to recognize and fight off infections effectively. Key types of APCs include dendritic cells, macrophages, and B cells, all working together to protect the body from harmful invaders.