Heart Diagrams

These heart diagrams show how things work

Here are some simple, easy to understand images and drawings that allow you to see how your cardiovascular system works.

You can see how your heart pumps blood around the body, through our lungs to exchange carbon dioxide for oxygen and then deliver oxygen rich blood to our body.

Your blood comes into the right side of your heart from the main veins in your body and gets pumped into your lungs. The blood then takes on oxygen from the lungs and is sent to your head and the rest of your body.

A Basic Heart Diagram


The blood flowing into the right side of your heart is short on oxygen and carries waste products(eg.carbon dioxide). When it gets to the lungs it dumps the carbon dioxide and takes on fresh oxygen.

Rich in oxygen now, your blood circulates to all parts of your body through your arteries. These are the channels that take your blood from the left side of your heart to the tissues in your body. They branch all the time and get smaller until your blood reaches the tiny capillaries.

Your heart is made of two chambers called the atrium and the ventricle.

The atrium gets the blood returning on its side and lets it flow into the ventricle while it is relaxed.

The left ventricle is the most powerful chamber and is the pump which pushes blood.

There are two coronary arteries that come out of the aorta. They send out large branches around the surface of the heart and these branch have many smaller branches deep into the heart muscle to supply fresh blood.

These two coronary arteries and branches can become blocked from atherosclerosis.

Heart muscle is stable, adaptable and tough but how well it works depends on how much oxygen it gets and nutrient rich blood from the coronary arteries.

If the muscle is starved of oxygen it will stop working in a minute or two. This is very serious and can stop your heart completely.

When there are blockages that are severe or there are many of them, it can seriously affect the nutrition of the heart muscle, especially the thick muscle of of the left ventricle.


Circulation Diagram

Your blood releases oxygen and nutrients and collects waste products from your cells. It continues to flow through the veins and soon gets back to the right side of your heart.

Then it does it all again.

Heart Diagrams to help you understand your body


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