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Fill in the blanks:
(a) Joints of the bones help in the ______ of the body.
(b) A combination of bones and cartilages forms the _____ of the body.
(c) The bones at the elbow are joined by a _____ joint.
(d) The contraction of the _____ pulls the bones during movement.
A joint is a connection between two or more bones that holds them together and lets them move. It allows the skeletal system to work as a whole.
There are three main types of joints in the human body:
1. Immovable Joints: These joints are stiff and fixed, so two or more bones that are close together can't move.
For example, skull bones.
2. Slightly Moveable: These joints are called cartilaginous joints because cartilage holds the bones together at the joint. It means that two or more bones are stuck together so tightly that they don't move much. But it is less stable than joints that don't move.
For example, vertebrae in the spine.
3. Movable: Also called synovial joints, these joints have synovial fluid in the space between the bones that connect them. This fluid makes it possible for all the parts of the joint to move smoothly against each other.
For example, the knee, elbow, shoulder, hip, and wrist.
A hinge joint is a type of synovial joint that allows motion in a single plane. It is formed when two or more bones meet and move along an axis to bend.
An elbow is an example of the synovial hinge joint between the humerus in the upper arm and the radius and ulna in the forearm which allows the forearm and hand to be moved in only one direction that is the forward direction, away from the body.
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