4.1 Different types of skeletons 1HVTTO

• Biologie
• Voortgezet speciaal onderwijs
• Leerroute 1

4.1 Different types of skeletons

• Jacket in your locker
• Put your things on your desk

       Laptop/Book

       Notebook, pencil case

• Bag on the floor
  
• Read pages 

Lessongoals

• Remember: I can list at least three functions of a skeleton in animals.
• Understand: I can describe in my own words what endoskeletons, exoskeletons and hydrostatic skeletons are and give one example animal for each type.
• Apply: I can classify at least ten animals or pictures into the correct skeleton type and explain my choice in one short sentence.
• Understand: I can explain what moulting is and describe in two or three sentences why animals with an exoskeleton need to moult.

Homework 4.1

Asgmt 1-8

What kind of skeletons can animals have?

Which animals have a skeleton?

Types of skeleton

• Endoskeleton > skeleton on the inside
• Exoskeleton > skeleton on the outside
• Hydrostatic skeleton > skeleton made out of water

Endoskeleton > internal skeleton

• Often made out of bones
• Animals with bones> vertebrates: mammal, bird, reptile, amphibian, fish
• Bones are living tissue, they grow and repair themselves
• Other types of endoskeleton

Sea urchins and starfish

Inside their bodies is a skeleton made out of fibers that are not bones!

Cuttlefish (type of squid)

Inside their bodies is a shell-like substance that is a skeleton

Exoskeleton > external skeleton

• Often made out of chitin
• Animals with exoskeletons> arthropods: insects, spiders, crabs, lobsters, etc.
• Exoskeletons are heavy and do not grow, animals with them will need to moult         to grow
• Other types of exoskeleton

The old exoskeleton breaks open.&nbsp;<div>The animal comes out and during a short period will be soft.&nbsp;</div><div>The animal can only grow during this time.&nbsp;<div>After a while the new exoskeleton will harden.<div><br></div></div></div>

shellfish

Instead of chitin, they have a shell made out of chalk

Chitin is a strong but somewhat flexible material.&nbsp;<div><br></div>

Hydrostatic skeleton > water skeleton

• made out of water, only strong in water
• Animals with hydrostatic skeletons> worms, water slugs, jellyfish
• Absorbing water helps them keep their shape, but make them flexible. It protects against bumps
• On land this type of skeleton is useless

What type of skeleton?

Write numbers 1-10 in your notebook
For each animal

• write its name (if you know it)
• Write the type of skeleton

1

2

3

4

5

6

7

9

10

8

These words I'll add to my PIF

What you should do: 4.1

• TB: pages  86-90
• WB/Lt: Asgmt  1-8

Done with the above?

• Work on the next chapter(s)
• Learn for the test 
• Make other homework
• Read a book

Zs = Working in Silence

• No asking questions
• Silent, don't disturb anyone
  
• Stay at your  desk

What you should do: 4.1

• TB: pages 86-90
• WB/Lt: Asgmt 1-8

Done with the above?

• Work on the next chapter(s)
• Learn for the test 
• Make other homework
• Read a book

Zw = Working with whispering

• Teacher is available for questions
• Only whisper with the student next to you
• Stay at your  desk

Tidy Duty

3 people each lesson

• Desks: empty and straight
• Chairs:  underneath the desks OR end of day: on the desks
• Floor: no rubbish