AQA The immune system in defence against disease

AQA The immune system in defence against disease immune system Cancer can weaken the immune system by spreading into the bone marrow The bone marrow makes blood cells that help to fight infection This lymphatic system All animals possess a primitive system of defense against the pathogens to which they are susceptible This defense is called innate, or natural, immunity and

lymphatic system The immune system is a complex network of organs, cells and proteins that defends the body against infection, whilst protecting the body's own cells

respiratory system The immune system has a vital role: It protects your body from harmful substances, germs and cell changes that could make you ill  The immune system is the body's tool for preventing or limiting infection Its complex network of cells, organs, proteins, and tissues