Educational worksheet for labeling the human heart system, including a blank version and an answer key.

Final Answer:

Here are the correct labels for the parts of the heart system, based on standard human anatomy and the answer key shown in the image:

Top left to right (arteries leaving the heart):
- superior vena cava → actually enters top right atrium (not an artery — correction: this is a vein)
Wait — let’s label properly by position as per diagram:

Looking at the labeled answer sheet:

From top going clockwise around the heart:

1. superior vena cava – brings deoxygenated blood from upper body into right atrium
2. right pulmonary artery – carries deoxygenated blood from right ventricle to right lung
3. left pulmonary artery – carries deoxygenated blood from right ventricle to left lung
4. left pulmonary veins – bring oxygenated blood from left lung to left atrium
5. right pulmonary veins – bring oxygenated blood from right lung to left atrium
6. aorta – largest artery; carries oxygenated blood from left ventricle to whole body
7. left atrium – receives oxygenated blood from lungs
8. left ventricle – pumps oxygenated blood into aorta
9. right atrium – receives deoxygenated blood from body via vena cavae
10. inferior vena cava – brings deoxygenated blood from lower body into right atrium
11. right ventricle – pumps deoxygenated blood to lungs via pulmonary arteries

Also, you’re asked to draw arrows showing direction of oxygenated and deoxygenated blood using 2 different colors.

→ Deoxygenated blood path (use one color, e.g., blue):
Body → superior/inferior vena cava → right atrium → right ventricle → pulmonary arteries → lungs

→ Oxygenated blood path (use another color, e.g., red):
Lungs → pulmonary veins → left atrium → left ventricle → aorta → body

So for labeling the diagram with letters or lines pointing to parts:

Match each line/number to these names:

If the diagram has numbered blanks or lines pointing to structures, here’s what they likely point to (based on typical textbook diagrams):

Assuming standard layout:

- Top center large vessel arching over: aorta
- Vessel entering top right: superior vena cava
- Vessel entering bottom right: inferior vena cava
- Chamber top right: right atrium
- Chamber bottom right: right ventricle
- Chamber top left: left atrium
- Chamber bottom left: left ventricle
- Vessels going to lungs from right side: pulmonary arteries (right and left)
- Vessels coming from lungs to left side: pulmonary veins (right and left)

Since the answer key is visible in the third panel, we can directly copy those labels:

Labels as shown in “The Human Heart System Answers”:

Starting from top and going clockwise:

- superior vena cava
- right pulmonary artery
- left pulmonary artery
- left pulmonary veins
- right pulmonary veins
- aorta
- left atrium
- left ventricle
- right atrium
- inferior vena cava
- right ventricle

(Note: The exact order may vary slightly depending on how the lines are drawn, but these are all the correct part names.)

For the arrow-drawing task:

Use two colored pencils or pens:

Color 1 (e.g., BLUE) for deoxygenated blood:
Draw arrows:
- From body → superior & inferior vena cava → right atrium → right ventricle → pulmonary arteries → lungs

Color 2 (e.g., RED) for oxygenated blood:
Draw arrows:
- From lungs → pulmonary veins → left atrium → left ventricle → aorta → body

This shows the full circulation loop.

✔ Final Labeled Parts (in no particular order — match to your diagram’s pointers):

- aorta
- superior vena cava
- inferior vena cava
- right atrium
- right ventricle
- left atrium
- left ventricle
- right pulmonary artery
- left pulmonary artery
- right pulmonary veins
- left pulmonary veins

And remember to add the colored arrows as described above.

You’ve got this! Just match each pointer on your worksheet to the correct name from the list, then draw the flow arrows with two colors.