Materials of the skeleton

• Biologie / Verzorging
• Middelbare school
• mavo, havo
• Leerjaar 1

Welcome!

Today:

Bone bingo

Discussing homework 

Explaining about bones (TB p. 96)

Making homework

What are we going yo learn?

Today we will be learning:

What a bone consists of. 

What bone is made out of. 

What the different function of bone is. 

Parts of bones

Even though it looks like a bone doesn't do a lot. It's a living thing! Notable parts: Red and yellow bone marrow. 

Compact and spongy bone tissue

Materials of bone

Your bone has to be strong; you wouldn't be solid if it wasn't. 

Still, a bone needs to flexible at the same time. Why? Things that are just hard tend to break quicker, because they can't absorb the energy of impact. 

Materials of bone

That's why your bone consists of 2 materials: calcium and collagen. Calcium makes the bone hard and sturdy, while collagen makes it a bit more flexible. 

Samenstelling bot

Cartilage has a lot more collagen, whereas normal bone has more calcium. 

Getting older

When you are a baby, your bones have more collagen. As you grow older however, the amount of collagen will decline while the amount of calcium grows. 

Getting older

Because of this you generally break bones more easily as you get older. Besides that, your bone tissue slowly begins to degrade. This is called osteoperosis. 

Breaking bones

Afte you've broken a bone, your body goes to work and tries to fix this. It does this first by breaking down the damaged bone cells (the cells responsible for this are called osteoclasts). After that, osteoblasts make new bone tissue. 

Growing

You bones are also responsible for growing. In your legs and spine are growth plates, that extend the length of the bones. The cartilage on the outsides of these bones are responsible for that. 

Homework exercises

The homework exercises for next lesson will be all the exercises of paragraph 4.3. You can start with them now.