Preventative measures

How does physical barrier work to prevent diseases?
Physical barriers that are always ready and prepared to defend the body from infection these include your skin, tears, mucus and stomach acid. The skins forms a protective layer shielding the blood vessel, organs, bones, muscles and nerves, when there is a cut or tear in the surface of the skin which provides an entrance. Glands beneath the skin produce the skin produce an enzyme which helps kill bacteria
The function of the immune system is to protect the body from harmful substances, such as pathogens and environmental pollution. The immune system provides three lines of defence.

How does chemical defences help prevent diseases?
The chemical defences recognise and destroys foreign substance and organism which enters the body. The body can distinguish between the body’s tissue and antigens. This allows cells of the immune alliances to identify and destroy only those enemy antigens

How does Phagocytosis work to help prevent diseases?
The two cells, macrophages and neutrophils both are white blood cells which remove bacteria, dead tissue cells and other tissue in the spleen called red pulp which helps remove red blood cells

How do antibodies work to help prevent diseases?
When an antigen enters the body, the immune system produces antibodies against it. Once a person has had a disease they don’t normally catch it again because the body produces memory cells that are specific to that antigen. The memory cells remember the microbe which caused the disease and rapidly make the correct antibody if the body is exposed to infection again. The pathogen is quickly destroyed preventing symptoms of the disease happening again

What is a vaccination?
Vaccination is a method of introducing antigens into your body to get your body's immune system to react to them by producing