Exploring the Skeleton The Skeleton is the name given to the collection of bones that holds
the rest of our body up. Our skeleton is very important to us. It does
three major jobs.
1. It protects our vital organs such as the brain, the heart and the
2. It gives us the shape that we have. Without our skeleton, we
would just be a blob of blood and tissue on the floor.
3. It allows us to move. Because our ...view middle of the document...
Hinge A joint which has adduction and abduction movements. Classic
examples are the elbow and the phalanges of the hand (fingers).
Pivot A joint which allows rotation in the socket. The atlas and axis
allow s your head to rotate. The forearm twists and untwists (flip
your hand back and forth) because of a pivot joint between the radius
Ball-and-socket The most flexible joints and also the strongest. These
allow swing and rotation and are very stable. The hip and the shoulder
are excellent examples.
The hardening process of bone is called ossification. Different
factors affect bone growth. A poor diet, smoking, hormonal imbalances
and physical stress can keep bones from growing to their full
potential or change the way that bones grow.
A synovial joint is filled with a clear blood plasma from the
capillaries and filtered through a membrane around it.
The fluid is called synovial fluid and the membrane which contains and
produces it is called a synovial membrane. The fluid works with pads
of fat which are stored around the joints to act as a cushion between
the bones. The fluid also helps maintain the cartilage in and around
the joint. You can see an...