BIOL 1103 Lecture Notes - Rarefaction, Breastfeeding, Exhalation

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Functions: protection of respiratory tract (s. t. food/saliva/etc don"t get into respiratory tract, assistance controlling intra-thoacic pressure (can close off airway => increased thoracic pressure (for straining or coughing, production of sound (via vocal folds. * false vocal fold inferior edge of quadrangular membrane: cricothyroid membrane = cricovocal mem = conus elasticus, musculature, extrinsic muscles, suprahyoids (digastric, myohyoid, stylohyoid, geniohyoid); raise. Infrahyoids (sternothyroid, omohyoid, sternohyoid, thyrohyoid); lower the larynx: fxn: raise/lower larynx, stabilize hyoid (so tongue can move), used in swallowing ii. In english all sounds produced by exhalation (not so in other cultures) i: can (1) produce sounds at larynx (2) produce sounds further up vocal tract (lips, tongue, etc, changes in breathing inhalation greater volume more quickly (control breathing) 1: exhalation variable force & rate; use mm. of inhalation to control rate of expiration, vocal fold vibration, due to changes in air pressure (first described by leonardo da. Vinci) folds are abducted for breathing & adducted for speaking.

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