The document discusses the key components of the human locomotor system. It includes bones that make up the skeleton, which comes in three parts and provides structure and protection. There are three types of bones - long, short, and flat. Joints connect the bones and also come in three types - flexible, semi-flexible, and fixed. Muscles are connected to bones and contract or relax to move the skeleton, with two types - voluntary and involuntary. Together, bones, joints, and muscles allow the human body to move.

1. The
locomotor
system

2.  The locomotor system is what lets us
move the different parts of our body.
 Includes:
Joints
Bones
Muscles

3. Skeleton
The skeleton is made up of bones.
An adult has 206 bones.
Bones are hard and rigid. They are very
strong and they don’t bend.
The skeleton has got three parts: skull, torso
and limbs.
The skeleton has got two functions:
- Supports our body.
- Protects the delicate organs inside our
body.

4. Skeleton
WEBSITE

5. Different types of bones
 The bones in our body are all different shapes.
 There are three types:
- Longs: arms and legs
- Shorts: spine, hands and feet
- Flats : the skull is made up of flat bones.

6. The joints
• Our bones are connected at joints.
• There are three types of joints:
- Flexible joint: allow our body to move a lot.
- Semi-flexible joints: let our bones move a little.
- Fixed joints: these joints can’t move.

7. Muscles
Muscles are soft when relaxed.
Are connected to bones.
They move our bones by contracting and relaxing.
When they contract they gets shorter when they relax they get longer.
Biceps and triceps work together. When one relax the other contract.
We have two types of muscles.
VOLUNTARY
We move them when we want.
Brain sends a signal to the muscle
when we want to move it
INVOLUNTARY
we can't control the movement
They move automatically.
Our heart and some of the stomach
muscles are involutary.

10. Games bones