Kinesiology 2230A/B Lecture Notes - Lecture 5: Peripheral Chemoreceptors, Central Chemoreceptors, Aortic Arch

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Published on 12 Apr 2013
School
Western University
Department
Kinesiology
Course
Kinesiology 2230A/B
Professor
The Bends
- Returning to the surface nitrogen gas will bubble within the body
Last day
- Arterial blood and muscle pH
- Ventilatory control
o Neural respiratory centres
Peripheral input
Cerb
Voluntarily change resp rate (hyperventilate)
Decrease in resp rate originates in medulla
Receives information to dictate to increase or decrease resp rate
Respiratory Neurons
- Inherent activity of inspiratory neurons in medial portion of the medulla
- Theses neurons activate diaphragm and intercostals
- Inhibitory influence of expiratory neurons
Neural control
- Resp rate will increase as soon as exercise begins
- Receiving info from stretch receptors from lung, can override these to increase tidal volume
- Insp/exp centres act upon external intercostals and diaphragm
- Exp
Ventilatory Control
- Chemical
- H
- PCO2, PO2, K
- - K associated with changes of K, increase in vent increase in K
- - changes in temperature
Chemical Control
- Aortic arch: changes of pressure (systemic circle)
- Exits heart, aorta bodies monitor changes in pressure
- Peripheral chemoreceptors monitor changes in pH, PCO2 and PO2
- Central chemoreceptors measure changes in pH and PCO2
- At rest most important stimulus is PCO2 in arterial plasma
- Central chemoreceptors are not sensitive to changes in PO2 of cerebral blood or CSF
Graph
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Document Summary

Returning to the surface nitrogen gas will bubble within the body. Ventilatory control: neural respiratory centres. Decrease in resp rate originates in medulla. Receives information to dictate to increase or decrease resp rate. Inherent activity of inspiratory neurons in medial portion of the medulla. Resp rate will increase as soon as exercise begins. Receiving info from stretch receptors from lung, can override these to increase tidal volume. Insp/exp centres act upon external intercostals and diaphragm. K associated with changes of k, increase in vent increase in k. Exits heart, aorta bodies monitor changes in pressure. Peripheral chemoreceptors monitor changes in ph, pco2 and po2. Aortic arch: changes of pressure (systemic circle) Central chemoreceptors measure changes in ph and pco2. At rest most important stimulus is pco2 in arterial plasma. Central chemoreceptors are not sensitive to changes in po2 of cerebral blood or csf. Significant drops in pp does not change response % in buffer zone .

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