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🦴 Skeletons and Muscles

The bones that hold you up and shield your insides, the joints that let you bend, and the muscles that pull in pairs to move you.

lessons

~15 min

to learn

🔬 Science

subject

Ages 6–12

level

Start the course →

What you’ll learn

Your Amazing SkeletonName the main bones and explain that the skeleton gives support and protection.Your skeleton is the frame of bones inside your body. It supports you so you can stand and keep your shape, and it protects soft parts — the skull guards the brain and the ribcage guards the heart and lungs. A grown-up has 206 bones of all sizes.
Bones That BendExplain that bones meet at joints, which allow different kinds of movement.Bones meet at joints, which let your body bend. Hinge joints like the knee and elbow bend one way, ball-and-socket joints like the shoulder swing all around, and the skull's joints are fixed and do not move. Joints are why your skeleton can move at all.
Muscles Make You MoveUnderstand that muscles pull on bones and work in antagonistic pairs to move a joint both ways.Muscles are attached to bones and move them by pulling — a muscle can only pull, never push. Because of this, muscles work in pairs: the biceps pulls to bend the elbow and the triceps pulls to straighten it. The heart is a special muscle that pumps blood without tiring.

Questions this course answers

What are the three main jobs of your skeleton?

Your skeleton supports your body, protects soft parts inside, and works with muscles to let you move.

Which bone protects your brain?

The skull is a hard, bony helmet that surrounds and protects your brain.

What does your ribcage protect?

The curved bones of the ribcage form a cage that guards your heart and lungs.

What do we call a place where two bones meet and can move?

A joint is where two bones meet and can move, letting your body bend.

What can a muscle do to move a bone?

A muscle can only pull. It gets shorter and tugs the bone it is attached to.

Your biceps bends your elbow. Which muscle pulls to straighten it again?

Muscles work in pairs. The biceps bends the elbow, and its partner the triceps pulls to straighten it.

Grounded in trusted sources

KidsHealth
BBC Bitesize
Britannica Kids
National Geographic Kids

Every Wunder lesson is built from real, reputable sources — never invented.

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