Question : In the given mechanism, diaphragm, sternum and intercostal muscles work work together to "_____" the thoracic volume and thereby pulmonary volume. This lead to "_____"in intra-pulmonary pressure to slightly "_____" the atmospheric pressure, causing expiration. Select the correct sequnence of words to complete the above paragraph ?

Question : In the given mechanism, diaphragm, sternum and intercosta

1.	Question : In the given mechanism, diaphragm, sternum and intercostal muscles work work together to "_____" the thoracic volume and thereby pulmonary volume. This lead to "_____"in intra-pulmonary pressure to slightly "_____" the atmospheric pressure, causing expiration. Select the correct sequnence of words to complete the above paragraph ?
Answer» decrease, decrease, below increase, decrease, above decrease, increase, above increase, increase, below Solution :During inspiration, the contraction of EXTERNAL intercostal muscles lifts up the ribs and the sternum to increase THORACIC volume. The given diagram shos expiration PROCESS. The relaxing diaphrapm and intercoastalmuscles return to their normal positions which reduce the thoracic volume and thereby the pulmonary pressure to slightly above the atmospheric pressure causing the explusion of air from the LUNGS, i.e,expiration.