External Intercostals And Its Effect On Inhalation

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With the production of each sound their first has to be air inhaled. This inhalation phase is ten percent of the process. When producing the word /sit/ it is like the quiet breathing inhalation process except it is quicker by about 1/10 because talking does not need as long of process. First, the quiet breathing begins with air pressure being taken into the lungs to cause the diaphragm to contract. The inhalation of air will cause the diaphragm to contract and flatten. The external intercostals will expand the rib cage and cause it torque out. The effect of using the diaphragm and external intercostals during inhalation is increasing thoracic and lung volume anteriorly to posteriorly. The lung pressure will decrease because it is relative…show more content…
The air flow will control how quickly the diaphragm goes up. The rebounding (equilibrium) forces also activated when lung-thorax unit is compressed. Their needs to be a maintained airflow and subglottal pressure. Use inspiratory muscles to control air flow coming out at first. Still contracts the diaphragm and controls how quickly it goes up. Still contracts the external intercostals and others to control rib cage. Going down slower and volume decreases much slower. Positive pressure in goes up in lungs much slower. Pressure has not changed as quickly and airflows out slower to use and talk on. Exhalation will continue until reaching resting expiatory level which means everything is balanced and no muscular activity. During ninety percent active exhalation the process is the same except it will contract ab muscles, then lower the rib cage, which will decrease thoracic lung volume anteriorly to posteriorly, alveolar pressure increases, compresses viscera, and pushes the diaphragm. The final step of this exhalation will include decrease of thoracic and lung volume superiorly to inferiorly and alveolar press…show more content…
The buccinator muscle influences the sound by the lips against the teeth which produced labiodentals and the vowel E sound. Both muscles pull the corners of the mouth laterally then a smile, vowel E sound, and facial expression can all be produced. The zygomatic major is a muscle that contributes to the sound production of /a/ because it pulls the corner of the mouth up and laterally which produces facial expression specifically a smile. What all four of these muscle have in common to produce the front vowel /i/ is they are all have the action of pulling the mouth laterally which in return would shape up for vowel production. Lastly, the depressor anguli oris will pull the corner of the mouth down to produce frowning, but also helped with lip compression with frowning still and production of /i/
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