The Human Heart - A printable worksheet for students to label the parts of the heart system.

To label the parts of the human heart correctly, we need to identify each structure based on its location and function. The heart has four chambers: two atria (top) and two ventricles (bottom). Blood flows in a specific direction: from veins → atria → ventricles → arteries.

Let’s go step by step using standard anatomical positions (remember: when looking at a diagram, the left side of the image is the right side of the body — because it’s drawn as if you’re facing the person).

We’ll match each red dot to the correct part using the word bank provided:

Word Bank:
- right ventricle
- superior vena cava
- left pulmonary artery
- aorta
- right pulmonary vein
- right atrium
- left atrium
- right pulmonary artery
- inferior vena cava
- left pulmonary vein
- left ventricle
- tricuspid valve
- pulmonary valve

Now, let’s assign labels starting from top to bottom, left to right (as seen in the diagram):

1. Top-left large vessel entering the right atrium → superior vena cava
2. Vessel coming from lungs into left atrium (left side of diagram) → left pulmonary vein
3. Large artery leaving left ventricle, arching over → aorta
4. Vessel going to lungs from right ventricle → right pulmonary artery
5. Chamber receiving blood from superior/inferior vena cava → right atrium
6. Chamber below right atrium → right ventricle
7. Valve between right atrium and right ventricle → tricuspid valve
8. Valve between right ventricle and pulmonary artery → pulmonary valve
9. Chamber receiving oxygenated blood from lungs → left atrium
10. Thick-walled chamber pumping blood to body → left ventricle
11. Vessel bringing deoxygenated blood from lower body → inferior vena cava
12. Vessel going to left lung → left pulmonary artery
13. Vessel bringing oxygenated blood from right lung → right pulmonary vein

Wait — let’s double-check with the diagram layout.

Actually, since there are 13 dots and 13 terms, we must map them precisely.

Standard labeling for this common worksheet:

Top row (left to right):
- Leftmost top dot: superior vena cava
- Next: aorta
- Rightmost top: left pulmonary artery

Middle row:
- Left middle: right pulmonary vein
- Center middle: right atrium
- Right middle: left atrium

Bottom row:
- Left bottom: right ventricle
- Bottom center: left ventricle
- Right bottom: inferior vena cava

Valves:
- Between right atrium and ventricle: tricuspid valve
- Between right ventricle and pulmonary artery: pulmonary valve

Also:
- right pulmonary artery goes to right lung (usually labeled near right ventricle exit)
- left pulmonary vein comes from left lung to left atrium

But wait — let’s use logic:

Blood flow path:
Deoxygenated blood enters via:
→ Superior vena cava (from upper body) → Right Atrium
→ Inferior vena cava (from lower body) → Right Atrium
→ Then through Tricuspid Valve → Right Ventricle
→ Then through Pulmonary Valve → Pulmonary Arteries (to lungs)

Oxygenated blood returns via:
→ Pulmonary Veins (from lungs) → Left Atrium
→ Through Mitral/Bicuspid Valve (not listed!) → Left Ventricle
→ Through Aortic Valve (not listed!) → Aorta (to body)

Note: The word bank does NOT include “mitral valve” or “bicuspid valve” or “aortic valve”, so we only label what’s given.

Given that, here’s the most accurate mapping for the 13 dots based on typical diagrams:

Assume the diagram has these 13 pointers:

1. Top-left vertical vessel → superior vena cava
2. Arching vessel at top center → aorta
3. Vessel branching off aorta to left lung → left pulmonary artery
4. Vessel entering left atrium from left lung → left pulmonary vein
5. Vessel entering right atrium from right lung → right pulmonary vein
6. Vessel exiting right ventricle to right lung → right pulmonary artery
7. Upper right chamber → right atrium
8. Lower right chamber → right ventricle
9. Upper left chamber → left atrium
10. Lower left chamber → left ventricle
11. Bottom vertical vessel entering right atrium → inferior vena cava
12. Valve between right atrium and ventricle → tricuspid valve
13. Valve between right ventricle and pulmonary artery → pulmonary valve

Yes — that matches all 13 terms.

So final labeling order (matching dot positions typically found in such worksheets):

From top to bottom, left to right:

Dot 1 (top left): superior vena cava
Dot 2 (top center, arch): aorta
Dot 3 (top right, branch): left pulmonary artery
Dot 4 (middle left, entering left atrium): left pulmonary vein
Dot 5 (middle center, entering right atrium from right lung): right pulmonary vein
Dot 6 (middle right, exiting right ventricle): right pulmonary artery
Dot 7 (upper right chamber): right atrium
Dot 8 (lower right chamber): right ventricle
Dot 9 (upper left chamber): left atrium
Dot 10 (lower left chamber): left ventricle
Dot 11 (bottom, entering right atrium from below): inferior vena cava
Dot 12 (valve between RA and RV): tricuspid valve
Dot 13 (valve between RV and PA): pulmonary valve

This covers all 13 items.

Final Answer:
superior vena cava, aorta, left pulmonary artery, left pulmonary vein, right pulmonary vein, right pulmonary artery, right atrium, right ventricle, left atrium, left ventricle, inferior vena cava, tricuspid valve, pulmonary valve