Respiratory

Respiratory - partial pressure gradient • O 2 is used by...

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Click to edit Master subtitle style 4/5/11 Exercise 6: The Human Respiratory
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4/5/11 Anatomy of the Respiratory System During ventilation , air travels into the airways down the pressure gradient trachea→bronchi→bronchioli→alve oli Is breathing an active or a passive
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4/5/11 Gas Exchange Gas exchange does not take place in the airways – this is called the “dead space” Gas exchange occurs at the alveoli – this is called “external respiration Alveoli are thin walled and highly vascularized Air is humidified – gas molecules dissolve into solution for diffusion down their partial pressure gradient
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4/5/11 Gas Transport O 2 diffuses into plasma and is loaded onto hemoglobin molecules A conformational shift allows more O 2 to bind Up to 4 per Hb Arterial O 2
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4/5/11 Cellular Respiration “Internal Respiration” At the tissues, O 2 diffuses into the cells and mitochondria down the
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Unformatted text preview: partial pressure gradient • O 2 is used by the mitochondria to generate ATP • CO 2 is produced and diffuses down its partial pressure gradient Oxyge n 4/5/11 Control of Ventilation • Factors that affect ventilation: – Arterial PCO 2 – pH – Arterial PO 2 – Temperature – Voluntary control – Exercise or anticipation of exercise or increase in workload • Receptors 4/5/11 Gas Composition and Key Terms • Normal room air – ~20.96% O 2, ~ .04% CO 2 , ~70% N 2 • Hypoxic – low oxygen content • Hypercapnic – high carbon dioxide content • Hyperpnea – increased breathing (as with exercise) • Hyperventilation – overly deep and rapid breathing 4/5/11 Lung Volumes and Capacities • Total lung capacity (TLC) – total volume of air in the lungs • Residual volume (RV) – volume that remains in the lungs after maximal exhalation...
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This note was uploaded on 04/05/2011 for the course NPB 101L taught by Professor Goldberg during the Spring '08 term at UC Davis.

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Respiratory - partial pressure gradient • O 2 is used by...

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