Human Heart Worksheet Blank Sketch Coloring Page - Free Printable

Let’s go step by step to label the parts of the heart in this diagram.

We’ll use standard heart anatomy and follow the arrows showing blood flow to help us identify each part.

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Step 1: Look at number 1

This is a large vein coming into the bottom right side of the heart. Blood flows upward into the heart here. That’s the inferior vena cava — it brings deoxygenated blood from the lower body to the right atrium.

→ So, 1 = inferior vena cava

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Step 2: Number 2

This is another large vein, but it’s on top, bringing blood down into the same chamber (right atrium). That’s the superior vena cava — brings deoxygenated blood from the upper body.

→ So, 2 = superior vena cava

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Step 3: Number 3

This is the chamber that receives blood from both veins (1 and 2). It’s the first chamber on the right side. That’s the right atrium.

→ So, 3 = right atrium

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Step 4: Number 4

This is the valve between the right atrium (3) and the next chamber below it. It opens to let blood flow down. That’s the tricuspid valve.

→ So, 4 = tricuspid valve

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Step 5: Number 5

This is the chamber below the right atrium. It pumps blood out to the lungs. That’s the right ventricle.

→ So, 5 = right ventricle

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Step 6: Number 6

There are two labels with “6”. Both point to arteries leaving the heart.

- The one going up and curving over the top? That’s the aorta — carries oxygen-rich blood to the whole body.
- The other one, going to the lungs? That’s the pulmonary artery — carries deoxygenated blood to the lungs.

Wait — actually, looking again:

The label “6” points to TWO different vessels:

- One is the big curved vessel on top → that’s the aorta
- The other is the vessel going to the lungs → that’s the pulmonary artery

But since they’re both labeled “6”, maybe the diagram uses “6” for both major arteries? Or perhaps it’s a mistake? Let’s check context.

Actually, in many diagrams, “6” might be used for pulmonary artery and “11” for aorta — wait, there’s an “11” pointing to the top curved vessel!

Look: Label “11” points to the big arching vessel with three branches on top — that’s definitely the aorta.

So then what is “6”? There are two lines labeled “6”:

- One points to the vessel going to the lungs → that’s the pulmonary artery
- Another “6” points to a smaller branch near the top — possibly a branch of the pulmonary artery or aorta? But likely, it’s meant to be the pulmonary artery as the main vessel.

Actually, let’s reassign based on standard labeling:

In most basic heart diagrams:

- Pulmonary artery = goes from right ventricle to lungs
- Aorta = goes from left ventricle to body

Label “11” is clearly the aorta (big arch).

Then the other “6” must be the pulmonary artery.

But why two “6”s? Maybe one is pulmonary trunk and one is branch? For simplicity, we’ll say:

→ 6 = pulmonary artery (the main one going to lungs)

And 11 = aorta

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Step 7: Number 7

Points to small vessels coming into the right atrium from the top — these are likely pulmonary veins? Wait no — pulmonary veins bring oxygenated blood to the LEFT atrium.

Actually, label 7 points to vessels entering the RIGHT atrium — those should be... wait, no — in this diagram, label 7 is pointing to vessels that look like they’re coming from the lungs? But that doesn’t make sense for right side.

Wait — let’s trace blood flow.

Deoxygenated blood enters right atrium via 1 and 2 → goes to right ventricle (5) → pumped out via pulmonary artery (6) → to lungs → returns via pulmonary veins → to LEFT atrium.

So label 7 — if it’s pointing to vessels entering the left side, it should be pulmonary veins.

Looking at the diagram: label 7 is on the left side of the image (which is the patient’s right side), pointing to vessels entering the top right chamber? No — actually, in anatomical position, the left side of the diagram is the patient’s right side.

Standard orientation: when you look at a heart diagram, the right side of the image is the patient’s left side.

So:

- Right atrium is on the left side of the diagram
- Left atrium is on the right side of the diagram

Label 7 is pointing to vessels entering the chamber on the right side of the diagram — which is the left atrium. Those are the pulmonary veins, carrying oxygenated blood from the lungs.

→ So, 7 = pulmonary veins

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Step 8: Number 8

This is the chamber on the right side of the diagram (patient’s left side) that receives blood from the pulmonary veins. That’s the left atrium.

→ So, 8 = left atrium

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Step 9: Number 9

This is the thick-walled chamber below the left atrium. It pumps blood out to the body. That’s the left ventricle.

→ So, 9 = left ventricle

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Step 10: Number 10

This is the valve between the left atrium (8) and left ventricle (9). It’s called the mitral valve (or bicuspid valve).

→ So, 10 = mitral valve

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Step 11: Number 11

As we said earlier, this is the large artery arching over the top, with three branches. It carries oxygenated blood from the left ventricle to the body. That’s the aorta.

→ So, 11 = aorta

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Now let’s list all answers clearly:

1. Inferior vena cava
2. Superior vena cava
3. Right atrium
4. Tricuspid valve
5. Right ventricle
6. Pulmonary artery
7. Pulmonary veins
8. Left atrium
9. Left ventricle
10. Mitral valve
11. Aorta

Note: Some diagrams may vary slightly, but this matches standard human heart anatomy and the direction of blood flow shown.

Final Answer:
1. Inferior vena cava
2. Superior vena cava
3. Right atrium
4. Tricuspid valve
5. Right ventricle
6. Pulmonary artery
7. Pulmonary veins
8. Left atrium
9. Left ventricle
10. Mitral valve
11. Aorta