You need to post an image with it, this is much too vauge without it.
Answer:
Because muscles generate small electrical signals when they contract, electrodes placed on the surface of the skin can measure muscle movements. ... When a prosthetic arm has several joints, such as a transhumeral, or above-elbow, prosthesis, each joint might need to be controlled by the same switch or muscle.
Explanation:
Hope this helps : )
because low self-esteem can lead to depression and make it hard for a person to have healthy relationships with others
