Asthma refers to a condition in which narrowing of airways takes place and generation of extra mucus occurs, which makes the process of breathing tough and further leads to coughing. It is a general long-term inflammatory condition of the lungs airways. Asthma comprises coughing, wheezing, shortness of breath, and chest tightness.
The increase in muscle tension that is produced by increasing the number of active motor units is called. recruitment. The type of contraction in which the muscle fibers do not shorten is called. isometric.
