9a_Chapter_6_7_Respiration_SV_V2

9a_Chapter_6_7_Respiration_SV_V2 - Chapters 6 & 7:...

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1 Respiration: At Rest and During Exercise Pulmonary Ventilation Key Points Pulmonary ventilation is a mechanical process by which air is moved into and out of the lung (inspiration, expiration) Inspiration is an active process in which the diaphragm and intercostal muscles contract, increasing dimensions and volume of the thoracic cage Expiration at rest is normally passive; the inspiratory muscles relax, decreasing the thoracic cage Forced inspiration and expiration are active processes involving accessory muscles. Lung volumes and capacities are measured by spirometry. To be reviewed on your own
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2 Respiration Pulmonary respiration Cellular respiration Pulmonary Respiration Occurs in the lungs. Provide a means of gas exchange between the external environment and the body. Is based on the principle of diffusion
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3 Anatomy of the Respiratory System Respiratory Membrane: Gas Exchange Alveolar wall Capillary wall Basement membranes (0.5-4.0 μ m) Gases will move along a concentration gradient based on partial pressures
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4 Anatomy of the Respiratory Membrane Gas exchange depends on:
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5 PO 2 of ambient air Based on 2 factors: 1. Total pressure of the gas mixture in ambient air. – The total pressure of any gas mixture is equal to the sum of the partial pressures of the individual gases in the mixture. – What is the barometric pressure? 2. Concentration of gas mixture in ambient air. – What is the concentration of oxygen in air? What is the PO
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This note was uploaded on 01/20/2012 for the course ESS 3317 taught by Professor Abel during the Spring '12 term at Texas State.

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9a_Chapter_6_7_Respiration_SV_V2 - Chapters 6 & 7:...

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