“The human heart pumps blood to every part of your body. The heart is our engine to the body.

Your heart is made up of four chambers, two on the right and two on the left. These are like the rooms of your house.

The top two chambers are called the left and right atrium and the bottom two are called the left and right ventricles.

They are divided by a thin wall called the septum.

There are four heart valves, which act like doors between the chambers of the heart. They open and close as your heart pumps.

The valves only open one way. This stops blood flowing in the wrong direction between the chambers of your heart.

Your conduction system sends the electrical signals which trigger the heart to pump blood around the body, and to and from the lungs.

Blood which has used all its oxygen is returned to the right side of the heart, via large veins called the inferior and superior vena cava. From there it is pumped to the lungs, via the pulmonary artery.

Once the blood has received oxygen from the lungs, it travels through the pulmonary veins into the left side of the heart. From here it is pumped back out around the body, via the aorta.”

Heart Foundation (https://www.heartfoundation.org.nz/your-heart/how-the-heart-works)