The immune system fights infection (microbes) through special organs, cells and chemicals.  The immunology of infectious disease studies how the immune system responds to infectious agents and how infectious agents interact with, modify or elude the immune system. More recent developments have shown that immunology may play an important role in the treatment of some cancers. Allergies occur when your immune system reacts to a foreign substance — such as pollen, bee venom or pet dander — or a food that doesn't cause a reaction in most people.

Diabetes is a disease marked by persistently high levels of blood sugar caused by inadequate or ineffective insulin, a hormone produced by the Beta cells of the pancreas.

Cancer is a group of diseases that involves abnormal growth of cells in potentially every part of our bodies. Some cancers are serious while others can easily be cured.  Survival rates of many types of cancers continue to improve, thanks to early detection, and timely, high quality management.

Hormones are produced by glands and special cells and are sent into the bloodstream to various tissues in our bodies as part of the endocrine system. Hormones influence almost every cell, organ and function in our bodies.

Musculoskeletal and skin systems represent the framework of our bodies and fundamental to good health.  Bones, muscles, tendons, ligaments, joints, and cartilage support our anatomy, and allow us to control every movement we make.

The lungs are the centre of the respiratory (breathing) system. All our cells need oxygen, and our bodies need to eliminate the unwanted gas they produce - carbon dioxide. Our lungs exchange these gases every time we breath in and out.

The heart is the hardest working muscle in the human body and pumps more than 8500 litres of blood every day. The cardiovascular system is made up of the heart, major blood vessels and fine arteries that deliver blood to every part of our body.

The brain is the central processing unit of the body and plays a key role in translating the content of the mind (your thoughts, feelings, attitudes, beliefs, memories and imagination) into complex patterns of nerve cell firing and chemical release. It is responsible for movements of all parts of our bodies, from our first steps to the fine movements of our hands to the smiles on our faces.