Movement of Arms

Movement of Arms

 

Movement of arm

Our skeletal system is made up of bones and these bones are joined together which gives shape, support to the body.

The muscles attached to the skeleton system helps in the movement of body parts like arms and legs.

The movement of our arms is controlled by two muscles- biceps and triceps.

•One end of the muscle is attached to a movable bone and the other end of the muscle is attached to a fixed bone.

•Muscles are attached to bones by tough cords called as tendons.

•Muscles work in pairs and bring about movement by contraction and relaxation.

•The paired muscles are biceps and triceps which together help in the movement of the structures like arm, leg etc.

•Contraction brings in the shortening of the muscle and relaxation brings about lengthening of the muscle. It makes the muscle short, thick and stiff to pull the bone.

•When we raise our arm, the biceps contract and triceps relaxes pulling up the arm.

 

•When we lower our arm, the biceps relax and triceps contract and helps in proper movement.