3.1 Bones, nothing but bones

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

Chapter 3

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 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

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 skeleton

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

Evolution completely

Just the skeleton (from E to A)

Why do we have a skeleton?

• It helps you move
• It protects your organs
• It gives you shape and strength
• It produces blood cells

And humans?

We have an endoskeleton, that contains 4 parts:

• Skull protects the brain
• Backbone (or spine) carries the weight and protects the spinal cord 
• Rib cage protects lungs and heart
• Limbs for locomotion (walking)

Spinal cord: consists of nerve tissue, so has to be protected. If the nerve tissue damages, you can't walk anymore

Read section 3.1

Do the exercises 1 up to and 6 from 3.1