Bricks 4.1 introduction Skeletal systems

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

The skeletal system

Skeleton

Organ system: Skeletal system

Organs: Bones

Tissues: Cartilage, bone, Marrow

Cells: Bone cells
Other: Calcium, collagen, blood vessels 

Which bones do you
already know?

Why do we have a
skeleton?
(looking for 5 best answers)

5 main functions

*Stability

*Protection of vital organs

*Shape
*Production of blood cells
*Movement (with muscular system)

3 kinds of skeletons

Some characteristics

Endo - on the inside, grows easily, normal weight.
Exo - on the outside, cannot grow, very heavy

Hydro - on the outside, grows easily, filled with water, very light (sort of skin)

3 skeletons: Endo - Exo - Hydro - skeleton

What kind of skeleton does a snake have?

1. Endoskeleton
2. Exoskeleton
3. Hydrostatic skeleton
4. Just its skin

What is not a function of the skeleton?

1. Strength
2. Flexibility
3. Production of blood cells
4. Stability

What kind of skeleton does a jellyfish have?

1. Endoskeleton
2. Exoskeleton
3. Hydrostatic skeleton
4. Just its skin

Invertebrates

• Don't have a backbone
• No endoskeleton

• Some invertebrates have a skeleton (exoskeleton) and legs, others don't

What kind of skeleton does this golden jewel beetle have?

1. Endoskeleton
2. Exoskeleton
3. Hydrostatic skeleton
4. Just its skin

What kind of skeleton does this blue caterpillar have?

1. Endoskeleton
2. Exoskeleton
3. Hydrostatic skeleton
4. Just its skin

What kind of skeleton does this betta fish have?

1. Endoskeleton
2. Exoskeleton
3. Hydrostatic skeleton
4. Just its skin

Vertebrates

classification of animals

Animals are divided into invertebrates (ongewervelden) en vertebrates (gewervelden).

Today focus:

 vertebrates

Exoskeleton

Arthropods (geleedpotigen),e.g. insects and spiders, 

have a skeleton made of chitin. 
This skeleton doesn't grow -> the animal has to moult. 

Arthropods

Crabs, lobsters and insects.

have an exoskeleton made of chitin. 

The joints are located at the outside of the skeleton and the muscles at the inside.

Animals with an exoskeleton can

1. not grow
2. grow
3. only grow when they moult
4. only grow once

Animals with an endoskeleton have muscles outside/inside their bones.

1. outside
2. inside

Animals with an exoskeleton have muscles outside/inside their bones

1. outside
2. inside

All skeletons have their own weight. What is the correct order from heavy to light?

1. exo - hydro - endo
2. exo - endo - hydro
3. endo - exo - hydro
4. hydro - endo - exo