what conditions cause contraction of the bronchial smooth muscle
Definition. Bronchospasm is an abnormal contraction of the smooth muscle of the bronchi, resulting in an acute narrowing and obstruction of the respiratory airway. A cough with generalized wheezing usually indicates this condition.Bronchospasm is a chief characteristic of asthma and bronchitis.escription. Bronchospasm is a temporary narrowing of the bronchi (airways into the lungs) caused by contraction of the muscles in the lung walls, by inflammation of the lung lining, or by a combination of both. This contraction and relaxation is controlled by the autonomic nervous system.
Contraction of smooth muscle in the walls of the bronchi and bronchioles, causing narrowing of the lumen. Compare: bronchoconstriction. /bronÂ·choÂ·spasm/ (brongÂ´ko-spazm) bronchial spasm; spasmodic contraction of the smooth muscle of the bronchi, as in asthma.pasm. 1. a sudden involuntary contraction of a muscle or group of muscles. 2. a sudden, transitory constriction of a passage, canal, or orifice; spasms usually occur when the nerves supplying muscles are irritated, and are often accompanied by pain.