LING 221 Chapter Notes - Chapter 5: Palatine Uvula, Geniohyoid Muscle, Genioglossus
11 Oct 2017
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Document Summary
Vital capacity: the total amount of air that is possible to exchange during respiration. Breathing in and then breathing out as much as possible. Internal and external intercostal muscles: main muscular engine of respiration. One attaches to the lungs and the other attaches to the inside of the ribs: the two membranes stick together through pleural linkage since they are both wet surfaces. Since the pleura are attaches to both the ribs and the lungs, when the ribs expand, so do the lungs. Diaphragm lowers which also increases the volume of the thoracic cavity: creates negative pressure which causes air to rush in. Tension of the diaphragm is released slowly. Once rest position of diaphragm and intercostals is reached, the internal intercostal muscles must contract. Normal speech uses about 50% of vital capacity. Vibration of the vocal folds: caused by a combination of vocal fold position and tension, and airflow: myoelastic aerodynamic theory of phonation.
