The skeleton and Joints.

Some more of my B7 notes on the skeleton and the joints and muscles in the body 

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  • Created by: abbie
  • Created on: 13-06-11 15:36
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The Skeleton
The skeleton supports your body and without it, you would be a jellified mess. It
also protects organs such as your heart and lungs. Your skull has the important job
of protecting your brain.
A Joint all two bones to meet making them able to move, that is why we can bend out
elbows and knees for example.
There are two types of joint:
1) Ball and socket
The ball and socket joints are the most versatile joints. They can
be found on your hip and shoulder. They can move in any
direction, like a computer joystick.
2) Hinge Joint
A hinge joint is more restricted and can only move backwards and
forwards. For example, you knee can only be moved a certain
amount forwards before not being able to move anymore. These are
found on the knee and elbow.
Ligaments hold two bones together at a joint and limit how much they can move. They
have a good tensile strength and are also slightly elastic.
Each bone is layered in cartilage which stops the bones rubbing
together and acts as a shock absorber.
Membranes at some joints produce synovial membrane which
lubricates the joints allowing them to move easier.

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Muscles can move bones!!
Bones are attached to muscles by tendons which also can
attach two muscles together.
As one muscle contracts (therefore pulling the muscle) the
other relaxes. To pull the muscle back down, the roles of
each muscle must switch. That's why muscles come in pairs
which work opposite each other. They are called
Antagonistic pairs.…read more

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