Biology • Circulatory system

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Exploration tips

What you see

A 3D model of the human heart with 16 structures in four groups.

Click a structure on the model or in the list to read about it and isolate it.

The pulmonary artery carries oxygen-poor blood (blue), while the pulmonary vein carries oxygen-rich blood (red).

Show position in the chest

Heart overview

Heart chambers

Valves and internal structures

Great vessels

Vessels supplying the heart

Choose a structure to see its position, role and the blood passing through it. Use the buttons below to isolate it or return to the whole heart.

Model notes

The model separates only one mitral leaflet and two tricuspid leaflets; the real valves have two and three. The activities never ask about individual leaflets.
The coronary arteries and cardiac veins are representative branches, not the full vascular tree.
Only the thoracic part of the inferior vena cava is included; the thoracic aorta is cropped in the overview so the heart fills the frame.
The chest layer is for orientation only and is not to scale with a full thorax.
The resource does not simulate mechanical contraction; the direction of blood flow is conveyed by highlighting and colour.

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