A joint is a place in a body where two or more bones meet.
How is a joint adapted to a friction free movement?.
-It contains synovial fluid which reduces friction at the joint.
0-The bones are covered with cartilage at the ends.
Structure of a joint.
A Tendon is a tough fibrous tissue that connects muscles to bones.
A Ligament is a fibrous elastic tissue that joins a bone to a bone.
Cartilage prevents the bone ends frictional damage after rubbing directly onto each other.
Inside a joint is a lining of synovial membrane which secretes synovial fluid.
Synovial fluid reduces friction in a joint.
Classification of joints:
Types of joints
Joints may be either Movable, immovable or slightly movable
However, the principle types of joints are: Ball and socket joints, hinge joint, pivot joint, gliding joint.
Examples of movable joints
- Hinge joint-It allows movement in one plane e.g. knee, elbow, knuckle
- Ball and socket– It allows movement in three planes e.g. shoulder, hip
- Gliding joint- They allow flat bones to slide over one another.eg wrist/ ankle
- Pivot joint– e.g. the neck.
Example of immovable joint.
Suture joints in the skull.
- How are joints important to a boy of 4 years?
- What is a joint?
- Write down one way joints are similar to muscles.
- Write down any one example of a hinge joint.
- Why is a shoulder joint said to be a movable joint?
- State the substance in the human body that helps to reduce friction.