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    Home » Key Stage 2 Science » The Human Skeleton – why do we have bones?

    The Human Skeleton – why do we have bones?

    October 12, 2014 By Emma Vanstone 5 Comments

    Do you know why we have bones? We’ve got some fun activity ideas to share today to help you find out!

    Fun facts about bones

    A human has 206 bones!

    There are 26 bones in the human foot.

    The femur is the longest bone in the human skeleton.

    Babies have about 300 bones when they are born, but some fuse together to form the final 206 adult bones.

    What is a skeleton

    The human skeleton is made up of all our bones and grows as we grow.

    Labelled diagram of the human skeleton
    Human Skeleton Diagram

    Did you know your skeleton has three main jobs?

    Why do we have bones? Functions of the human skeleton

    Skeleton Function 1 – Support

    Your skeleton stops you being all floppy, acting like a scaffold to hold up the soft tissues of your body. The spine is a good example of part of the skeleton with a supportive role. Place your hands on the centre of your back, can you feel your spine? It runs from your head to your pelvis and consists of 33 small ring like bones called vertebrae.  It holds up your head and allows your body to bend. The spine also protects the spinal cord which runs through the centre.

    Can you thread some cotton reels onto a piece of string? This is a bit like your backbone. The cotton reels represent the vertebrae and the string the spinal cord. This would also work well using egg cartons cut up into segments.

    Spine Models – Why do we have bones?

    Model of the spine made with cotton reels - backbone model #scienceforkids #humanbodyscience
    Cotton reel spine model

    Spell Outloud made a great model of a spine using hair bands and pool noodle segments.

    spine model with pool noodles

    This candy model of a spine from Adventures in Mommydom is amazing too!

    candy model of a spine

    Skeleton Function 2 – Protection

    Your skeleton is hard and strong, providing the perfect protection for your soft internal organs. A good example of part of the skeleton with an important protective role is your skull, which helps keep your brain safe if you bang your head. Can you think which part of the skeleton protects your heart and lungs?

    Skeleton Function 3 -Movement

    Bones are rigid, but they have clever joints allowing us to move with a bit of help from muscles. If you wiggle your fingers can you see the bone joints?

    If you bend your arm can you see the bulgy muscle above your elbow? This is your bicep.

    Children could also draw around themselves and the draw as many bones as possible.

    So, that’s why we have bones!

    What is a joint?

    A joint is where two or more bones meet. Some are fixed in place, some move a lot and others move just a  little.

    Hinge joints –  found in the elbow and knee allow people to bend and straighten arms and legs.

    Ball and Socket joints which are found in the shoulders and hips allow movement in different directions.Did you know the longest bones in the body are found in the arms and legs. These bones are shaped like a tube and are very strong.A piece of paper on its own is not very strong at all, but if you roll it up and stand it on its end it will stand up on it’s own and even support the weight of something on top. We discovered this when we learned about strong shapes.

    how strong is paper experiment for learning about why we have bones

    Make a bendy bone

    To make bendy bone, soak a chicken bone in vinegar for a few days, you should find that the bone becomes bendy. This is because the vinegar reacts with the calcium carbonate in the bones, breaking it down and making the bones softer.

    How can you keep your bones healthy?

    Find out how to keep bones healthy in this post and practice fixing broken bones on a doll with modroc.

    Doll with a modroc bandage

    Do you have any fun activities related to bones to share?

    More activities for learning about bones

    We love this life size skeleton from Fun at Home with Kids

    The Imagination Tree has a fun math game all about bones.

    I Can Teach My Child explains why we need muscles and bones using a pancake and a cookie.

    Make some play dough feet like An Ordinary Life

    Even more bone science ideas

    Try some easy Halloween science with one of these fantastic Halloween Science Experiments

    Or try one of our other fun ideas for learning about your body.

    Suitable for Key Stage 1 Science

    Why do we have bones?

    Last Updated on June 18, 2021 by Emma Vanstone

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    Safety Notice

    Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

    These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

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