An earthworm has a soft body and no

An earthworm has a soft body and no bones. “It uses liquid inside its body as its skeleton”. This is known as a Hydrostatic Skeleton

Many of the invertebrates that live in water also have a hydrostatic skeleton to support their body. For example: This Starfish.

The same is true for a sea anemone. It also uses water to support its body.

Meanwhile some other creatures that live on land or in water have an external skeleton known as an Exoskeleton. An example of this is the lobster.

Amongst the most common creatures with an Exoskeleton are the insects. This is a type of beetle

The Endoskeleton of a shark is make of Cartilage (like bone but a little softer)

However all of the vertebrates have a different type of skeleton that is inside the body and is called an Endoskeleton. This is made of either Bone or of Cartilage. An example is the bone skeleton of a bird

Or in an amphibian, like this poison dart frog.

An of course, this is the type of skeleton that we humans have.

What type of skeleton do the following animals have? 1) Slug 2) Seal 3) Ladybird 4) Cow 5) Killer Whale 6) Crabs

What type of skeleton do the following animals have? 1) Slug = hydrostatic skeleton 2) Seal = endoskeleton 3) Ladybird = exoskeleton 4) Cow = endoskeleton 5) Killer Whale = endoskeleton (from cartilage) 6) Crabs = exoskeleton

On the next slide: Copy the diagram of the skeleton and add the labels in the box at the top

The Human Endoskeleton

The Human Endoskeleton Skull Jawbone Humerus Ribs Vertebrae Pelvis Patella (kneecap) Ankle bones Clavicle (collarbone) Sternum Ulna Radius Femur Fibula Tibia

Functions of the Skeleton: The function of the skeleton is to: - Protect the vital organs - To support the body – creates a framework for muscles to attach to. Muscles attach to bone by tendons. - To produce blood cells – bone marrow is where white and red blood cells are produced. - To help the body move – if a muscle pulls on a bone it will cause the bone to move. What is the purpose of the following parts of the skeleton? a. b. c. d. Skull? Ribs? Spine? Patella (kneecap)?

Functions of the Skeleton: The function of the skeleton is to: - Protect the bodies organs - To support the body - To produce blood cells - To help the body move What is the purpose of the following parts of the skeleton? a. Skull? To protect the brain. b. Ribs? To protect the organs inside thorax c. Spine? To give the body support and provide a surface for the different nervous systems to stem from. d. Patella (kneecap)? To protect the knee joint

Build your own skeleton! Find the worksheet ‘Make-a-skeleton-Kt’. Use it to build your own skeleton! Stick this into your books.

Plenary Questions: