Question

Contraction of the abdominal
muscles is important in *
O Normal (quiet) inspiration
O Forced (maximum) inspiration
O Forced (maximum) expiration
O Normal (quiet) expiration​

Answer 1

Answer:

A shallow breath, called costal breathing, requires contraction of the intercostal muscles. ... During forced expiration, accessory muscles of the abdomen, including the obliques, contract, forcing abdominal organs upward against the diaphragm. This helps to push the diaphragm further into the thorax, pushing more air out.The diaphragm and, to a lesser extent, the intercostal muscles drive respiration during quiet breathing.The primary inspiratory muscles are the diaphragm and external intercostals. Relaxed normal expiration is a passive process, happens because of the elastic recoil of the lungs and surface tension.During forced exhalation, internal intercostal muscles which lower the rib cage and decrease thoracic volume while the abdominal muscles push up on the diaphragm which causes the thoracic cavity to contract.