Eventually, the bronchi become known as bronchioles â the smallest air tubes in the lungs. This system of air tubes can be thought of as an upside down tree, with the trachea being the main trunk and the bronchi and bronchioles being the branches. The medical term for all the air tubes is 'the respiratory tract'.
An injury to the vertebrae or discs in your neck can cause pain, numbness, or weakness in your shoulder, arm, wrist, or hand because the nerves that extend out from between the neck provide sensation and allow for movement in these areas.
Some diseases such as Parkinson's disease or multiple sclerosis cause uncontrollable shaking of hands or hand tremor as there is destruction of the nerve tissue. Stroke, head injury, excessive stress, strong emotions, physical exhaustion may also cause uncontrollable shaking of hands or hand tremor.