Respiratory centers - diaphragm and external intercostals...

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5/17/11 “Respiratory Center“ is located largely in the medulla oblongata of the brain stem. It is part of the autonomic system and as such is not controlled voluntarily (we can control some aspects of breathing [e.g., during speech, or singing], but this is controlled by the cerebral cortex). While resting, the respiratory center sends out action potentials that travel along the phrenic nerves into the diaphragm and the external intercostal muscles of the rib cage, causing inhalation. Relaxed exhalation occurs between impulses when the muscles relax.
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5/17/11
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5/17/11 Respiratory Centers Pontine respiratory center reduces duration of inspiration (thus can cause respiration to increase or decrease); receives input from higher centers (e.g., cortex) and thus adjusts inspiration for speech, exercising, etc. VGR = sends motor (contraction) signals for 2 seconds to
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Unformatted text preview: diaphragm and external intercostals for tidal inhalation. They also fire expiratory neurons for 3 seconds to allow passive OR active expiration. These set rhythmicity of tidal or resting respiratory cycle. DGR = are involved in altering the pattern for ventilation in response to the physiological needs of the body for O2 and CO2 exchange and for blood acid-base balance related to metabolic demands. 5/17/11 Cortical level : voluntary control over respiration for activities such as speech, singing, coughing, etc. Medullary rhythmicity center: set basic respiratory rate, and adjust for levels of activity and metabolic demands Pontine center: limits inhalation duration Proprioceptive stretch receptors in the lungs, pleura, and thoracic wall convey information about the degree of the filling of the lungs...
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This note was uploaded on 05/16/2011 for the course SPA 3101 taught by Professor Carson,d during the Spring '08 term at University of Central Florida.

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Respiratory centers - diaphragm and external intercostals...

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