iphy 3430 lecture 8

iphy 3430 lecture 8 - RESPIRATORY SYSTEM Purpose: Maintain...

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RESPIRATORY SYSTEM Purpose: Maintain blood levels of O2 and CO2 as homeostatic variables
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Fig. 13-2, p. 453
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Additional parts of anatomy involved in respiration Nervous system: Pons, Medulla Phrenic nerve and other motor nerves
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Physical Principles 1. Gas flows from area of high pressure to low pressure 2. The rate of flow depends on the pressure gradient: the greater the gradient, the faster the flow and the larger the volume of air that moves 3. When gas is compressed in a smaller volume, the pressure increases.
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INHALATION 1. Medulla sends signal via motor nerves to diaphragm, external intercostals, causing contraction 2. Those muscles cause expansion of the volume of the thoracic cavity 3. The increased volume of the thoracic cavity causes the lungs to expand 4. The expansion of the lungs causes a decrease in air pressure in the lungs relative to outside air 5. Air flows into lungs down pressure gradient.
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759 mmHg 760 Inhalation at rest 761 760 Exhalation at rest Atmospheric/alveolar pressure differentials during inhalation/exhalation at rest
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This note was uploaded on 05/25/2008 for the course IPHY 3430 taught by Professor Lynch,robe during the Summer '08 term at Colorado.

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iphy 3430 lecture 8 - RESPIRATORY SYSTEM Purpose: Maintain...

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