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What are bones made of? micro-lesson
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What are bones actually made of? Well, did you know that 70% of your bones are made from nonliving tissue, minerals like calcium? Our bones have three distinct layers to them. The cortical bone is the outermost bone, it's hard, smooth and solid, and it protects the inner parts of the bone. The next innermost layer is the cancellous bone. Cancellous bone is porous and spongy it's a lighter bone and it allows blood vessels to move through it so that our bones bend slightly. The innermost layer of our bones is called bone marrow. When children are born, they only have one type of bone marrow, red marrow. This is where your white and your red blood cells are made. But as we grow to adults, we end up with about 50% of red marrow and we have about 50% of yellow marrow. Yellow marrow contains fat cells. Our bones contain nonliving tissue and living tissue and have three different layers.
Answer time
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Here are some example of questions about this video that kids may be asked in the 1Question app to earn screen time.
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How many layers are there in a bone?
1) 32) 13) 44) 2 -
What percentage of red marrow do adult bones contain?
1) 0.52) 13) 0.14) 0.6 -
How are adults' bones different from childrens' bones?
1) Adult bones are made up of red and yellow marrow, while children's bones are mostly red marrow.2) Adult bones have more non-living tissue.3) Adult bones have more layers than children's bones.4) They are not different, they are the same. -
Cancellous bone is spongy and can
1) Bend slightly2) Asborb water3) Make oxygen4) Clean things -
The outer most layer of bone is called
1) Cortical bone2) Cancellous bone3) Bone marrow4) Skin -
Why do cancellous bones bend?
1) To help prevent them from breaking2) To make you flexible3) To help you bend your knees and arms4) To help you touch your toes -
Adults and children have the same exact bone structure.
1) No2) Yes
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Meet your educator
Our micro-courses are developed and delivered by qualified educators from around the world.
Kerry Wadsley
Teacher at The Elms School, UK, for over 10 years, teaching students from 0-11 years. I taught in Key Stage 2 as well as being the Special Educational Needs Coordinator at the school.
More lessons from Kerry
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