imunity system of human beings ? The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against harmful pathogens, such as bacteria, viruses, fungi, and parasites. The immune system plays a crucial role in maintaining overall health and preventing infections. Here are key components and functions of the human immune system: Components of the Immune System: White Blood Cells (Leukocytes) Neutrophils: Phagocytic cells that engulf and digest pathogens. Lymphocytes: Including T cells, B cells, and natural killer (NK) cells, which play roles in adaptive and innate immunity. Monocytes/Macrophages: Phagocytic cells that ingest and break down pathogens. Lymphoid Organs: Thymus: Where T cells mature Bone Marrow: Site of blood cell production, including B cells and some immune system components. Spleen and Lymph Nodes: Spleen Filters blood and removes damaged blood cells. Lymph Nodes: Bean-shaped structures that filter lympha...