List and give a brief description of the cells of the immune system of the human body.

The cells of the immune system of the human body are divided into two main categories: innate immune cells and adaptive immune cells. Innate immune cells include phagocytes such as neutrophils and macrophages, which ingest and destroy pathogens. Natural killer cells are another type of innate immune cell that targets infected or cancerous cells. Adaptive immune cells include T cells and B cells, which respond to specific antigenic targets. B cells produce antibodies that bind to and neutralize pathogens, while T cells can directly kill infected cells or assist in the immune response. Dendritic cells also play a crucial role in the adaptive immune response by presenting antigens to T cells, helping to activate them. Overall, the immune system is composed of a complex network of cells and molecules that work together to protect the body from harmful invaders.