skeletonThe human skeleton consists of 206 bones.
We are actually born with more bones (about 300), but many join together as we grow up.

Red blood cells are made in our bones

Bones contain (and need) a lot of calcium (a substance found in milk and  cheese).

The longest bone in our bodies is the femur (thigh bone).
The smallest bone is the stirrup bone inside the ear.

Uses for bones in the skeleton:
1. Some bones protect organs
•The Skull protects the brain
•The ribs protect the lungs and heart

2.Some bones support
•The femur supports us when we stand

3.Some bones protect and support
The spine (backbone) supports the head and protects the spinal nerve

3.Bones help us move
Muscles are attached to bones.
The muscle contracts and pulls on the bone making the bone move
.

Summary:
Bones
1. support your body,
2. protect organs and
3. Allow movement

Movement

When muscles contract (get shorter) they pull on bones causing the bones to move.
Muscles are attached to bones using tendons

achilles tendon

The Achilles tendon joins the calf muscle to the bones in the heel

Bones are held tothether at the joints with ligaments
.muscles3

Muscles are usually in pairs.
When one muscle contracts and pulls  the other relaxes

 

Moving the arm DOWN. The lower muscle contracts.

 

Lifting the arm UP. The upper muscle contacts.

 

Test yourself

1.What do we need to eat to help keep our bones  healthy?Answer

2.Give three uses for the bones in our skeleton:  Answer

3.Some bones support and some protect organs
Add the word PROTECTS or SUPPORTS
(Place your mouse over the dotted lines)

The thigh bone (femur)    …………………. your body

The spine ………………… the spinal cord

The spine  ………………… the top half of your body

                        The ribs  ………………… your heart and lungs

                        The skull …………………  the brain