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What is the soft, red material inside some bones where new red blood cells are made?
Marrow
What do we call the place where two bones meet?
Joint
What is made of millions of long cells and helps your body move?
Muscle
What do muscles do when they stop contracting and become longer again?
Relax
What do we call muscles that work automatically and that you don't have to think about controlling?
Involuntary Muscles
What is the largest bone in the human body?
Femur
What is made up of 206 different bones and supports your body?
Skeleton
What strong fibre joins a voluntary muscle to a bone?
Tendon
What muscle in your upper arm contracts when you bend your arm?
Bicep
What flexible material inside some joints stops the ends of bones from touching?
Cartilage
What bones protect your heart and lungs?
Ribs
What part of the skeleton protects your brain?
Skull
What do we call muscles that you can contract and relax whenever you want?
Voluntary Muscles
