What are the functions of B- cells, T- helper cells, cytotoxic t cells, regulatory t cells, phagocytic cells.

B-cells: These cells produce antibodies that help destroy harmful pathogens such as bacteria, viruses, and fungi. When a B-cell recognizes a specific pathogen, it will produce antibodies that bind to and neutralize the pathogen, signaling other immune cells to attack and eliminate it. T-helper cells: T-helper cells activate and direct other immune cells in fighting infections. They help B-cells produce antibodies and assist in the activation of cytotoxic T-cells, which destroy infected cells. Cytotoxic T-cells: These cells are responsible for killing infected cells and cancer cells. They recognize and destroy cells that have been infected with a pathogen by releasing toxic molecules that cause the infected cell to undergo programmed cell death. Regulatory T-cells: These cells help regulate and control the immune response, preventing it from attacking healthy cells and tissues. They suppress the activity of other immune cells, which is important in preventing autoimmune diseases where the immune system mistakenly attacks the body's own cells and tissues. Phagocytic cells: These cells are responsible for engulfing and digesting pathogens and other foreign substances. They include macrophages, neutrophils, and dendritic cells, which all play important roles in the immune system's response to infection. When pathogens enter the body, phagocytic cells migrate to the site of infection and engulf the invading organism.