Educational worksheet for learning about the skeletal system with interactive exercises.

Let’s go step by step to fill in the blanks using the word bank.

Word bank:
brain, calcium, ligament, tendon, osteocalcin, elbow, bone marrow, rigidity, 206, cartilage, joint, vital organs, lungs, heart

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Question 1: There are ______ bones in the human body.
→ We know from basic biology that an adult human has 206 bones.
✔ Answer: 206

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Question 2: The skeletal system provides ______ and strength to the body.
→ Bones give our body shape and stiffness — that’s called rigidity. It also gives strength.
✔ Answer: rigidity

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Question 3: ______ helps in attaching the bone to the muscle.
→ Tendons connect muscles to bones. Ligaments connect bones to other bones. So here it’s tendon.
✔ Answer: tendon

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Question 4: The main mineral of the bone is ______.
→ Bones are hard because they contain a lot of calcium (in the form of calcium phosphate).
✔ Answer: calcium

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Question 5: Red and white blood cells are produced in the ______.
→ Inside some bones, there’s soft tissue called bone marrow where blood cells are made.
✔ Answer: bone marrow

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Question 6: ______ is present between two bones, which helps provide cushioning and prevents friction.
→ That’s cartilage — like the smooth stuff at the ends of bones in joints.
✔ Answer: cartilage

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Final Answer:
1. 206
2. rigidity
3. tendon
4. calcium
5. bone marrow
6. cartilage