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The Mechanism and Regulation of Breathing.
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Angela Carpenter The Mechanism and Regulation of Breathing. Breathing is an involuntary movement that is controlled by the medulla, which is part of the hind brain. Air is sucked into the lungs by an active process called inspiration. The external intercostals muscle contract and the internal intercostals muscle relax this causes the ribs to be drawn upwards and outwards. While this is happening the diaphragm muscles contracts and pushes down towards the abdomen. The lungs are made to expand because the pleural surfaces of the lungs are attached to the pleural on the chest wall; this increases the volume of the air spaces and drops the air pressure in the lungs so that air rushes in. Expiration is mainly an involuntary reaction to the external intercostals and diaphragm muscles relaxing. The elastic fibres in the stretched lung are recoiled which allows the ribs and diaphragm to return to their original position....
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