Lecture 39 - Respiratory Physiology III

Lecture 39 - Respiratory Physiology III - Tuesdays)Class...

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Tuesday’s Class RESPIRATORY PHYSIOLOGY III Chapter 11 pp. [email protected] Chapter 9 pp. [email protected]
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What you should be able to do by the end of today’s lecture RESPIRATORY PHYSIOLOGY III Explain the regulation of breathing in mammals. Compare the oxygen carrying proteins in animals and explain how chemical and physical factors affect oxygen affinity. Compare the movement of oxygen and carbon dioxide in its various forms.
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Control of Breathing Air breathers Elevated blood PCO 2 Elevation of even 0.5 kPa can double ventilation effort Decreased blood PO 2 Decrease must be far below “normal” levels before this initiates breathing behavior Water breathers Decreased blood PO 2 Blood PCO 2 less effective as a sensor because of high solubility of CO 2 in water. Gas partial pressures chemically sensed by nervous system to control breathing behavior
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Regulation of Breathing Figure 11.42 Rhythmic firing of central pattern generators in the medulla initiate ventilatory movements via nerve signal
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Chemoreceptors for respiratory gases
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