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How Do Our Bones Grow? micro-lesson

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Are your bones the same size they were as when you were baby? No. they've grown. But how do our bones grow? When babies are first born, they have about 300 bones in their body but an adult or a child only has 206 bones. So where do these other 94 bones go? Well, when you are first born, you have a lot of cartilage, that's a softer more flexible tissue. Then as you grow up, calcium goes in and encompasses the cartilage and turns it into bone through a process called ossification. Ossification starts in the middle of your bone and then spreads outwards making your bone grow longer. Ossification completes when we're about in our 20s. So, what happens to those other 94 bones? Well, babies are born with cartilage like we said and as their bones grow through ossification, some of those bones meet and begin to fuse together.

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  • How many bones would a normal 1 year old have?

    1) 300
    2) 206
    3) 254
    4) 312
  • How many bones would a normal 22 year old man have?

    1) 206
    2) 300
    3) 254
    4) 312
  • Why do babies have more bones than adults?

    1) As babies grow and ossification occurs, bones fuse together
    2) Babies need more bones because they are smaller
    3) As babies grow and ossification occurs, bones disappear
    4) Adults need fewer bones because they are bigger
  • At what age do our bones stop growing?

    1) In our 20s
    2) In our 30s
    3) 10 years old
    4) 18 years old
  • What do we need to help our bones grow?

    1) Calcium
    2) Magnesium
    3) Water
    4) Oxygen
  • What are babies' bones made from?

    1) Cartilage
    2) Muscle
    3) Ossification
    4) Tissue
  • How do our bones grow?

    1) Ossification
    2) Stretching
    3) Eating vegetables
    4) Cartilage
  • Where does ossification start?

    1) The middle of the bone
    2) The end of the bone
    3) The side of the bone
    4) Outside of the bone
  • Ossification causes our bones to grow

    1) Longer
    2) Thicker
    3) Smaller
    4) Thinner
  • Ossification is

    1) When calcium turns cartilage into bone
    2) When bones stop growing
    3) When oxygen turns into bone
    4) When magnesium turns into bone
  • Are your bones the same size they were when you were born?

    1) No
    2) Yes

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Meet your educator

Our micro-courses are developed and delivered by qualified educators from around the world.

Kerry Wadsley

Kerry Wadsley

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