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1. Hinge Joints: Hinge work like the hinges in a door. Bones
connected in this way can move only in one direction. The
elbow, knee, toe and finger joints are hinge joints.

Shoulder Joint 2. Ball and Socket Joints: They have one Knee joint
bone which has a socket into which the ball of Pivot joint
another bone fits. This helps the connected
bones to move in many directions. The hip and
shoulder joints are examples of such joints.

3. Pivot Joint: This is found between the skull and the first two
vertebrae of the spine. This joint allows the side to side and
up and down movement of the skull.

4. Gliding Joints: They allow movement between the
connecting bones. These are found between the vertebrae
and in the wrist and ankle.

The Human Muscular System Writst joint

Muscle is a soft tissue in the body of humans. They are responsible for maintaining
posture, physical movement like sitting, walking, eating, etc. and movement of
internal organs such as keeping the heart pumping to circulate blood and moving food
through the digestive system. Muscles make our body flexible. There are about 650
muscles in the body. Muscles work in pairs. They perform contraction and relaxation.

When you flex a muscle, it contracts
or gets shorter. On relaxing it goes
back to its original shape. There are
three types of muscles on the basis of
controlled actions.

1. Voluntary Muscles: Voluntary
muscles move when we want
them to. When we lift a weight
or move our arm we are using

voluntary muscles. These muscles are all in our control. The biceps and triceps in
our arms are examples of voluntary muscles.

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