L2: What are bones made of?

• Biologie
• Middelbare school
• havo
• Leerjaar 1

Get ready: 

1. Notebook + Pen
2. Homework types of skeletons
3. LessonUp

HW Uploaded?!

Discussion of Homework

• Sheets 'Type of skeletons'
  
• 5 minutes
  

lesson 2: What are bones made of? 

Experiment: Bones 

What are bones made of?

• Collagen: Flexibility
  
• Calcium & Phosphorus: Hard
  

What happened during the experiment? 

Bones are alive?

Bone = hard and solid

Cartilage = soft and rubbery

Layers of the bone

1. Periosteum (pare-ee-OS-tee-um)

-membrane that contains nerves and blood vessels

2. Compact bone

3. Cancellous bone (KAN-sell-us)

(sponge like)

4. Bone marrow

How do bones grow?

• 300 bones (Baby) -> 206 bones (adult)
  
• Cartilage as baby becomes bone with help of calcium
  
• Bones fuse together
• Age 25 -> growing is finished

What type of skeleton do we have?

1. Exoskeleton
2. Endoskeleton
3. Liquid skeleton

What do bones mainly need to remain hard?

1. Calcium
2. Collagen
3. Water
4. Cartilage

What is the function of bone marrow?

1. Protection
2. Shape
3. Movement
4. Blood cell production

What is the periosteum?

1. A thin membrane around the bone
2. Cartilage at the end of the bone
3. A bone located in the leg

What are vertebrates?

1. Animals that live underwater
2. Animals that shed their skin once in a while
3. Animals that have a spinal column
4. Animals that have very long hair

What happens when you put a bone in an acidic solution?

1. It becomes brittle
2. It becomes harder
3. It becomes flexible
4. noting happens

Why does the bone become flexible?

1. Because the collagen dissolves
2. Because the calcium dissolves

Homework

Worksheet bones

Update your mind map with topics of lesson 2 (screenshot)