Exam 1 Part 11 Flashcards
Number of cycles of vibration per second
Frequency (Hz)
Given a constant volume flow of air or fluid, at a point of constriction there will be a decrease in pressure perpendicular to the flow and an increase in velocity of the flow
Bernoulli effect
At the point of the constriction, the pressure will _____ and the velocity will ______
Decrease, increase
Why is the Bernoulli principle important?
Negative pressures allow the vocal folds to come to the midline and positive pressures open the vocal folds
Opening phase of glottis ______ shape
Convergent
____ vocal folds open and close first
Inferior
Closing phase of glottis is ______ shape
Divergent
Vocal fold vibration results from aerodynamic forces and elastic properties of vocal folds
Myoelastic Aerodynamic Theory of Phonation
Minimum area in the vocal folds that allows for phonation
Phonatory adductory range
Subglottal pressure should be _____ than supraglottal pressure for air to move through the glottis
Greater than
Difference between subglottal and supraglottal pressure
Transglottal
The subglottal pressure must always be ____ for vocal fold vibration to occur
Positive
If subglottal pressure is equal to atmospheric pressure what happens?
No phonation occurs
Minimal amount of positive subglottal pressure needed to initiate and sustain vocal fold vibration
Phonation threshold pressure
If subglottal pressure is below the phonation threshold pressure (PTP), then ______ occurs
No phonation
