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Who we are Our vision is a world free from the fear of heart and circulatory diseases. We raise money to research cures and treatments for the world’s biggest killers. It’s a muscle, about the size of your fist, in the middle of your chest tilted slightly to the left. What is the function of the human heart? Each day, your heart beats around 100,000 times.

This blood delivers oxygen and nutrients to all parts of your body to help your organs and muscles work properly. Your blood also carries away unwanted carbon dioxide and waste products. What is the structure of the human heart? Your heart has a left side and a right side, they are separated by a thin muscular wall called the Septum.

Both sides of your heart have an upper chamber and a lower chamber. The right side of your heart receives the de-oxygenated blood that has just travelled round your body. It pumps the blood to your lungs to collect a fresh supply of oxygen. The left side of your heart pumps the re-oxygenated blood round your body again.

What does the heart’s electrical system do? Your heart’s electrical system tells your heart when to contract and when to relax to keep your blood pumping regularly. The instructions to contract and relax are carried by electrical signals. The electrical signals are sent from the sinus node which is known as your heart’s natural pacemaker. How does blood flow around the heart and the body? Your heart is linked to the rest of the circulatory system with blood vessels called arteries and veins. Your blood flows around your heart and the rest of your body in one direction, like a one-way traffic system.