The circulatory system activity - Free Printable

Let's solve the labeling task on the image of "The Circulatory System".

Step 1: Understand the diagram and the labels

We are given four terms to place in the correct boxes:
- blood vessels
- heart
- blood
- nutrients and oxygen

We also have a description at the top:
> "The circulatory system is like a transport system. It carries nutrients from food we eat and oxygen from the air we breathe around the body. It's made up of the heart, the blood and the blood vessels."

This tells us that:
- The heart pumps blood.
- Blood carries nutrients and oxygen.
- Blood vessels are the tubes through which blood flows.

Now, let’s analyze the diagram:

---

Step 2: Identify what each arrow points to

1. Top left box (with arrow pointing to the magnified circle showing red blood cells)
→ This shows a close-up of blood, with red blood cells carrying oxygen and other components.
✔ So this should be labeled: blood

2. Box pointing to the heart (center of the chest)
→ Clearly shows the heart, the central organ of the circulatory system.
✔ Label: heart

3. Box pointing to the network of red and blue lines throughout the body
→ These are the blood vessels (arteries, veins, capillaries).
✔ Label: blood vessels

4. Bottom right box (arrow pointing toward the body from the heart)
→ This represents what is being carried by the blood — nutrients and oxygen — delivered to the body’s tissues.
✔ Label: nutrients and oxygen

---

Final Answer:

Label the boxes as follows:

- Top left box (magnified blood): blood
- Right side (heart): heart
- Bottom right (network of vessels): blood vessels
- Bottom left (arrow going into body): nutrients and oxygen

---

Summary Explanation:

- Blood is the fluid that carries substances.
- The heart pumps the blood.
- Blood vessels are the pathways for blood flow.
- The blood delivers nutrients and oxygen to all parts of the body.

✔ This completes the labeling correctly based on the circulatory system's function.