Your body's circulatory system comprises the blood, heart and blood vessels. It moves oxygen and nutrients around the body, and removes carbon dioxide. Find out more, including about the problems that can occur.
Blood and blood vessels
Blood flowing through the blood vessels carries oxygen, nutrients and waste around the body. Find out the components of blood.
The heart pumps blood around the body to supply tissues with nutrition and oxygen. Find out about how it works and a number of health problems related to the heart.
Heart and cardiovascular conditions
Learn more about the conditions that affect your heart and cardiovascular system, such as high blood pressure, angina and heart disease.
The human body has many different systems and organs that all serve different function. Learn more about the brain, heart, digestive system and other parts of the body.
Cardiac enzyme tests can check whether the heart muscle is damaged, and indicate if a person has had a heart attack.
White blood cells
White blood cells are a vital part of your immune system, detecting and dealing with infections. Find out more more about health problems involving white blood cells.
Cholesterol and lipid tests
A cholesterol (or lipid profile) test looks at the various levels of cholesterol and other fats in your blood.
A heart transplant is an operation to replace a damaged heart with a healthy donor heart. Learn about waiting lists and life after a transplant.
Atrial fibrillation (when part of the heart ‘quivers’ rather than beating normally) could lead to a stroke. Know the symptoms and decrease your risk.