Humerus is the bone of arm , it connects the shoulder joint (scapula) to the elbow joint (ulna&radius) , it (with muscles) forms the main bulk of the upper arm .             Humerus is a bone that is found in the arm and it help you to move your arm so you can pick stuff up.
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Biofeedback is the use of computer sensors to help you recognize the relationship between psychological processes and physiological changes within your body. With practice, you can learn to bring these processes under voluntary control and exert more control over your bodily responses to stressful events.