BS 2 - The structure of bones

• Biologie
• Middelbare school
• havo
• Leerjaar 1

BS 2 - The structure of bones

Today's lesson

1. Discuss paragraph 4.2 - The structure of bones

2. Time for homework

Bones and cartilage

The skeleton consists out of 2 types of tissue: 

Bone (bot) and cartilage (kraakbeen)

But..

What are bones made of?

Structure of bones

Bones exist out of calcium phosphate (=kalkzouten) and collagen (=lijmstof). 

Calcium phosphate makes the bone strong and rigid.

Collagen makes the bone flexible

Changes of bone tissue

The skeleton of a baby consists mostly of cartilage tissue.

During growth, most of the cartilage changes to bone.

When you get older:

--> Amount of collages decreases

--> amount of calcium phosphate increases.

baby is flexible because they have a lot of collagen in their bones

Old people break bones easier because they have less collagen.

Fontanelles are openings in between the bones of the skull

Shrinking of the fontanelles

Fontanelles close up over time, this strengthens and closes the skull. The proces takes about 1,5 years.

Question time!

Where do bones consist of?

1. Collagen and calcium phosphate
2. Cartilage and calcium phosphate
3. cartilage
4. collagen

Do the bones of older people have more collagen?

1. yes
2. no

Do the bones of baby's have more calcium phosphate?

1. yes
2. no

Cartilage has more collagen than calcium phosphate. This makes cartilage ...

1. flexible
2. strong

What material is in a nose?

1. Cartilage
2. Bone

What makes bone strong?

1. collagen
2. calcium phosphate
3. cartilage

What material is in this bone?

1. Cartilage
2. Bone

Your ear is made of....

1. cartilage
2. spongy bone
3. compact bone
4. marrow

Homework

- Do 4.1: Exercise 5 (Only add the names of the bones to the picture: Figure 6)

- Do 4.2: Exercises 1, 2, 3, 5, 6, 7

- Read 4.2 and 4.1

Make sure to study the bones of the body (use the bone song if you want)

https://www.youtube.com/watch?v=2gerXkG_8ME&ab_channel=Mr.R.%27sSongsforTeaching