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.
Myasthenia gravis causes weakness of the voluntary muscles. Voluntary muscles are those that are under your control. Autonomic muscles, such as the heart and the digestive tract, are usually not affected. The muscle weakness of myasthenia gravis worsens with activity and improves with rest. The muscle weakness can lead to a variety of symptoms, including: 1  Breathing difficulty because of weakness of the chest wall muscles.  Chewing or swallowing difficulty, causing frequent gagging, choking, or drooling.