Immune System - an overview

AQA The immune system in defence against disease immune system The two subsystems within the immune system are closely linked and work together whenever a germ or harmful substance system789 We tend to take our immune systems for granted But they work hard to keep us healthy This complex system of cells is the body's primary defense system,

digestive system Immune response, like that caused by a viral infection, can affect sleep At the same time, consistent sleep strengthens the immune system,