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8 Jan 2026

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Understanding the Heart: A Detailed Diagram and Key Notes

Libby

@libbysnotes

Your heart is basically a powerful pump that never stops... Show more

♡♡♡ the heart ♡♡♡

Pulmonary artery
takes deoxygenated
blood to the lungs

Vena Cava
brings
deoxygenated
blood into the
heart
Right
A trum

The Heart: Your Body's Pump

Ever wonder how your blood gets everywhere it needs to go? Your heart is like a non-stop delivery service, made from special cardiac muscle tissue that never gets tired like your arm muscles do.

Here's the clever bit: your heart has two completely separate sides doing different jobs. The right side deals with deoxygenated blood (blood that's used up its oxygen), whilst the left side handles oxygenated blood (fresh blood loaded with oxygen).

The right atrium receives tired blood from your body through the vena cava, then the right ventricle pumps it to your lungs via the pulmonary artery. Meanwhile, the left atrium gets freshly oxygenated blood back from the lungs through the pulmonary vein, and the powerful left ventricle sends it racing around your body through the aorta.

Key Point: Remember that your heart's right side sends blood TO the lungs, whilst the left side sends blood TO the rest of your body. The coronary artery keeps your heart muscle itself supplied with oxygen - even your heart needs its own blood supply!

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1 page

Understanding the Heart: A Detailed Diagram and Key Notes

Libby

@libbysnotes

Your heart is basically a powerful pump that never stops working, pushing blood around your entire body 24/7. Understanding how it works is crucial for biology, and once you get the basics, it's actually quite straightforward!

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The Heart: Your Body's Pump

Key Point: Remember that your heart's right side sends blood TO the lungs, whilst the left side sends blood TO the rest of your body. The coronary artery keeps your heart muscle itself supplied with oxygen - even your heart needs its own blood supply!