Human Body System Questions worksheet with fill-in-the-blank and matching exercises.

Let’s go step by step to answer each question based on what we know about the human body systems.

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Questions 1–4: Basic Body Organization

These questions are asking about how the body is built — from smallest to largest parts.

1. What is the smallest unit of life in the human body?
→ The smallest living thing in your body is a cell. Everything else is made from cells working together.

2. Cells group together to form?
→ When many similar cells work together, they make a tissue. For example, muscle tissue is made of many muscle cells.

3. Tissues are grouped together to form various?
→ Different tissues combine to make an organ. Like your heart is made of muscle tissue, nerve tissue, and blood tissue.

4. Organs work together as part of an?
→ Organs that do related jobs form an organ system. For example, your stomach, intestines, and liver work together as the digestive system.

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Questions 5–15: Matching Systems to Functions

We’ll match each body system with its main job using the Word Bank.

Let’s go one by one:

5. Skeletal System → Gives your body shape and holds you up → Support

6. Muscular System → Lets you move your arms, legs, etc. → Movement

7. Respiratory System → You breathe in oxygen and breathe out carbon dioxide → Oxygen / carbon dioxide exchange

8. Circulatory System → Moves blood (which carries oxygen, nutrients, waste) around your body → Transport

9. Excretory System → Gets rid of waste like pee and sweat → Waste removal

10. Nervous System → Controls your thoughts, feelings, and actions → Control (or Regulation and control — but “Control” fits best here since it’s simpler)

Wait — let’s check the word bank again. It has both “Regulation and control” and “Control”. Since Nervous System does both, but “Regulation and control” is more complete, we’ll use that for Nervous System.

Actually, looking at the list:

- Endocrine System also does regulation (hormones), so maybe:
- Nervous System = Regulation and control
- Endocrine System = Control? But that doesn’t fit well.

Wait — let’s think carefully.

Standard matches:

- Skeletal → Support
- Muscular → Movement
- Respiratory → Oxygen/carbon dioxide exchange
- Circulatory → Transport
- Excretory → Waste removal
- Nervous → Regulation and control (because it controls everything fast)
- Immune → Protection (fights germs)
- Integumentary (skin!) → Protection (also keeps things out)
- Endocrine → Regulation and control? But we already used that.

Hmm — the word bank has two “Protection” entries. That makes sense because both Immune and Integumentary protect.

Also, “Food absorption” must be Digestive.

“Reproduction” is obviously Reproductive System.

So let’s assign:

5. Skeletal System → Support

6. Muscular System → Movement

7. Respiratory System → Oxygen / carbon dioxide exchange

8. Circulatory System → Transport

9. Excretory System → Waste removal

10. Nervous System → Regulation and control (it controls body functions quickly via nerves)

11. Immune System → Protection (from diseases)

12. Integumentary System → Protection (skin protects from outside harm)

13. Endocrine System → Control (uses hormones to control slow processes like growth)

Wait — but “Control” is vague. Actually, Endocrine is often called “regulation”, but since “Regulation and control” is taken by Nervous, and “Control” is left, we can use “Control” for Endocrine.

But let’s see the word bank again:

Word Bank:
- Transport
- Support
- Oxygen / carbon dioxide exchange
- Regulation and control
- Protection (x2)
- Food absorption
- Waste removal
- Control
- Movement
- Reproduction

So we have 11 systems to match, and 11 words (with Protection repeated).

Let’s list them clearly:

5. Skeletal → Support ✔

6. Muscular → Movement ✔

7. Respiratory → Oxygen / carbon dioxide exchange ✔

8. Circulatory → Transport ✔

9. Excretory → Waste removal ✔

10. Nervous → Regulation and control ✔ (best fit)

11. Immune → Protection ✔

12. Integumentary → Protection ✔ (second protection)

13. Endocrine → Control ✔ (hormonal control)

14. Reproductive → Reproduction ✔

15. Digestive → Food absorption ✔ (digestive system absorbs food into blood)

Perfect — all matched!

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Final Answer:

1. Cell
2. Tissues
3. Organs
4. Organ system
5. Support
6. Movement
7. Oxygen / carbon dioxide exchange
8. Transport
9. Waste removal
10. Regulation and control
11. Protection
12. Protection
13. Control
14. Reproduction
15. Food absorption