Locomotor system
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The The locomotor locomotor system system
description
it's a power point about locomotor system for primary students
Transcript of Locomotor system
The The locomotor locomotor systemsystem
The locomotor system is what lets us move the different parts of our body.
Includes:
Bones
Joints Muscles
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.
Different types of bones The bones in our body are all different shapes.The bones in our body are all different shapes. There are three types:There are three types:
- Longs: arms and legsLongs: arms and legs
- Shorts: spine, hands and feetShorts: spine, hands and feet
- Flats : the skull is made up of flat bones.Flats : the skull is made up of flat bones.
The jointsThe joints• Our bones are connected at joints.Our bones are connected at joints.
• There are three types of 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.
MusclesMusclesMuscles 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 INVOLUNTARY
We move them when we want. we can't control the movement
Brain sends a signal to the muscle They move automatically.
when we want to move it Our heart and some of the stomach
muscles are involutary.
