BS 2 - The structure of bones

• Biologie
• Middelbare school
• havo
• Leerjaar 1

self reading

where: pg 14 / 15

Bones and cartilage

The skeleton consists out of 2 types of tissue: 

Bone (bot) and cartilage (kraakbeen)

But..

What are bones made of?

BS 2 - The structure of bones

Today's lesson

1. Check HW

2. Do paragraph 4.2 - The structure of bones

3. Exercise 2 pg. 72

4. Review questions

self reading

where: read on page 13 t/m 15( text book)

how: alone and in silence. one person is reading loud for the class

time: 5 min

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.

Where do bones exist 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
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

practical 

where : page 12 t/m 15

how: in pairs

time: 10 min each practical

read the instructions carefully