Immunology is the study of the immune system, which is a complex network of cells and organs that work together to protect the body from infection. The immune s...
Immunology is the study of the immune system, which is a complex network of cells and organs that work together to protect the body from infection. The immune system is divided into two main parts: the innate immune system and the adaptive immune system.
The innate immune system is activated by pathogens directly and without prior exposure. It consists of physical barriers like skin and mucous membranes that prevent pathogens from entering the body. Additionally, there are cells like macrophages and dendritic cells that recognize and engulf pathogens. The innate immune system also includes cells that can recognize and activate inflammation.
The adaptive immune system is activated by pathogens that have been encountered before and have developed memory. It consists of cells like B cells and T cells that recognize and destroy pathogens. B cells are responsible for humoral responses, where antibodies are produced, which bind to and neutralize pathogens. T cells are responsible for cell-mediated responses, where they recognize and destroy infected cells through various mechanisms like cytotoxicity, cytokine production, and cell signaling.
The immune response involves the activation of immune cells by antigens, the binding of antibodies to pathogens, and the activation of T cells. This activation leads to the differentiation of immune cells into effector cells, which eliminate pathogens or present antigens to other immune cells