Respiratory Control & Group Pacemaker Hypothesis. Flashcards
Central Chemoreceptors
Increased PCO2
Sensitive to changes in pH of the cerebrospinal fluid
An increase in arterial PCO2 results in…
diffusion of CO2 from the blood into the brain which lowers pH and stimulates the central chemoreceptor to send signals to the respiratory control center to increase breathing
Results in increased alveolar ventilation and the the elimination of CO2
Peripheral Chemoreceptors:
Carotid Body (Increased PCO2, Decreased pH and PO2); Aortic Body (Increased PCO2, Decreased pH)
Carotid Body
Sensitive to changes in arterial PO2, PCO2, and pH; Increase in arterial PCO2 stimulates the carotid body to send signals to the respiratory control center to increase breathing
Relative role of O2 vs CO2 in stimulating VE
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Motor Cortex
Sends out impulses to activate skeletal muscles to contract and increase ventilation in proportion to the amount of exercise being performed; Neural impulses pass through the medulla and “spill over” causing a VE that reflects the number of muscle motor units being recruited
SKM Mechanoreceptors
Muscle Spindles, Golgi Tendon Organs, and Joint pressure receptors
Respiratory Muscle Training & the Metaboreflex.
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Ventilatory Adaptations to Endurance Exercise Training.
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