Human Heart Diagram
Free printable human heart diagram — a labeled cross-section showing the four chambers, the aorta, pulmonary artery, pulmonary veins and vena cava. Download a high-resolution PDF or PNG for Letter paper.
The parts of the heart
The heart is a muscular pump that keeps blood moving all around the body. Here is what happens at each labeled part of the diagram:
| Part | What it does |
|---|---|
| Aorta | The body's largest artery; it carries oxygen-rich blood out to the whole body. |
| Superior vena cava | A large vein that returns oxygen-poor blood from the upper body to the heart. |
| Pulmonary artery | Carries oxygen-poor blood from the heart to the lungs to pick up oxygen. |
| Pulmonary veins | Bring oxygen-rich blood back from the lungs into the heart. |
| Right atrium | The upper right chamber that receives oxygen-poor blood returning from the body. |
| Left atrium | The upper left chamber that receives oxygen-rich blood from the lungs. |
| Right ventricle | The lower right chamber that pumps blood out to the lungs. |
| Left ventricle | The lower left chamber that pumps oxygen-rich blood out to the body. |
Companion worksheet
A free fill-in worksheet with an answer key, built from the labels above — students match each part to its description, then answer a couple of short questions. Great for a quick check after using the diagram.
How to print
Choose Download PDF for a ready-to-print file that fits US Letter paper (8.5 × 11") in portrait, or Download PNG for the high-resolution image.
Frequently asked questions
What does the heart do?
The heart is a muscular pump that pushes blood around the body, delivering oxygen and nutrients and carrying away waste.
How many chambers does the heart have?
The heart has four chambers: two upper chambers called atria and two lower chambers called ventricles.
What paper size should I print this on?
The diagram is sized for standard US Letter paper (8.5 × 11") in portrait orientation. Use "Download PDF" for a print-ready file that fits the page automatically.