Unit 4: Support and locomotion B2

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

Planning

• Planning coming weeks 
• Quick recap last week
• Basic 2: the structure of bones (10 min)
  


• Demo practicum  (20 min)
  

Planning coming weeks

Week
17 jan	B2 + B3
24 jan	B3 + B4
31 jan	Repetition + test

Learning goals

• You can describe the structure of bone tissue and cartilage tissue.
  
• You can describe how the composition of the bones changes during a person’s life.
  

What is not a function of the skeleton?

1. Gives support and gives shape
2. The skeleton helps us think
3. Protects organs
4. Helps is move together with muscles

The skeleton is a ...

1. organism
2. organsystem
3. organ
4. tissue

The cat is a ...

1. Plantigrade - walks on the soles of the feet
2. digitigrade - walks on the toes
3. unguligrades - walks on hooves

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.

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

Demo practicum

We are going to look at the collagen and calcium phosphate in bones.