Educational worksheet for identifying parts of the immune system with labeled diagrams and a word bank.

Sure! Let’s solve this Science Worksheet: Parts of the Immune System step by step.

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🧬 Word Bank:

You’re given these terms to choose from:
- lymph nodes
- thymus
- spleen
- white blood cell

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🔍 Step-by-step Matching:

We’ll match each image with the correct term from the word bank.

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#### ✔ Image 1 (Top Left):
Visual: A reddish, bean-shaped organ — this is the spleen.
→ *Function*: Filters blood, stores white blood cells and platelets, removes old/damaged red blood cells.
Answer: spleen

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#### ✔ Image 2 (Top Right):
Visual: A small, butterfly-shaped organ in the chest — this is the thymus.
→ *Function*: Where T-cells mature; important in early immune development.
Answer: thymus

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#### ✔ Image 3 (Middle Left):
Visual: Two bean-shaped organs near the kidneys — these are lymph nodes.
→ *Function*: Filter lymph fluid, trap pathogens, house immune cells.
Answer: lymph nodes

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#### ✔ Image 4 (Middle Right):
Visual: A pair of lungs — but wait! This doesn’t belong to the immune system directly. However, since we must pick from the word bank, and lungs aren’t listed… this might be a trick or error. But looking closer — it’s actually likely meant to represent lymph nodes again? No — that doesn’t fit.

Wait — let’s reconsider. The image may actually show thymus? No, thymus is already matched.

Actually — this image looks like the lungs, which are NOT part of the immune system *per se*, but they do have immune functions. Since “lungs” isn’t in the word bank, and all other images are clearly immune organs, this may be a mistake in the worksheet — OR — perhaps it’s meant to be lymph nodes? But no, lymph nodes are shown in image 3.

Let me check again: Actually, upon closer inspection — Image 4 (middle right) appears to show two lobes of the thymus? No, thymus is usually single.

Wait — maybe it’s spleen? No, spleen is image 1.

Hold on — I think there’s a mislabeling possibility. But let’s look at the next ones.

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#### ✔ Image 5 (Bottom Left):
Visual: Round cells with nuclei — classic depiction of white blood cells.
→ *Function*: Fight infection; include neutrophils, lymphocytes, etc.
Answer: white blood cell

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#### ✔ Image 6 (Bottom Right):
Visual: Another set of round cells — also white blood cells (possibly different type, like lymphocytes).
→ Still falls under “white blood cell”.
Answer: white blood cell

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But now we have a problem — we have 4 unique terms but 6 images. That means some terms will be used more than once.

Looking back:

- Spleen → Image 1 ✔️
- Thymus → Image 2 ✔️
- Lymph nodes → Image 3 ✔️
- White blood cell → Images 5 & 6 ✔️

What about Image 4 (middle right)? It shows what looks like lungs — but lungs are not in the word bank. So either:

- It’s a mistake in the worksheet, OR
- It’s meant to represent thymus again? Unlikely.
- Or perhaps it’s lymph nodes? But image 3 is clearly lymph nodes.

Wait — maybe Image 4 is the spleen? No, image 1 is spleen.

Actually — I think Image 4 is meant to be the thymus, but drawn differently? Or perhaps it’s an error.

Alternatively — maybe the worksheet intends for Image 4 to be “lymph nodes” as well? But that’s duplicate.

Let’s re-express based on standard biology diagrams:

✔ Standard matches:

| Image | Organ/Cell |
|-------|---------------------|
| 1 | Spleen |
| 2 | Thymus |
| 3 | Lymph nodes |
| 4 | ??? (likely error — possibly meant to be another view of thymus or lymph node) |
| 5 | White blood cell |
| 6 | White blood cell |

Since “lungs” isn’t in the word bank, and all 4 terms must be used, and white blood cell can be used twice, perhaps Image 4 is also “lymph nodes” — even though image 3 is already lymph nodes? Maybe it’s showing lymph nodes in different locations.

In many worksheets, multiple images of the same structure are used.

So let’s go with:

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## ✔ Final Answers:

| Image | Which part? |
|-------|--------------------|
| 1 | spleen |
| 2 | thymus |
| 3 | lymph nodes |
| 4 | lymph nodes | ← (assuming it's another view or location)
| 5 | white blood cell |
| 6 | white blood cell |

> 💡 Note: If your teacher expects only one answer per term, then Image 4 might be a trick — but since “lungs” isn’t in the word bank, and lymph nodes are often shown in multiple locations (neck, armpit, groin), it’s reasonable to label Image 4 as lymph nodes too.

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## 📝 Summary:

✔ Completed Worksheet Answers:

1. spleen
2. thymus
3. lymph nodes
4. lymph nodes *(or if allowed, leave blank — but best to use word bank)*
5. white blood cell
6. white blood cell

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## 🧠 Quick Review of Functions:

- Spleen: Filters blood, stores immune cells.
- Thymus: Maturation site for T-cells.
- Lymph nodes: Filter lymph, trap germs.
- White blood cells: Directly attack pathogens.

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Let me know if you’d like a printable version or coloring guide! 😊