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Respiratory centers - diaphragm and external intercostals...

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5/17/11 “Respiratory Center“ is located largely in the medulla oblongata of thebrain stem. It is part of theautonomic systemand as such is not controlled voluntarily (wecan control someaspects of breathing [e.g., during speech, or singing], but this is controlled by the cerebral cortex). Whileresting, therespiratory center sends out action potentials that travel along the phrenic nerves into the diaphragmand the external intercostal muscles of therib cage, causing inhalation. Relaxed exhalation occurs between impulses when themuscles 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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