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ANP 1105 Study Guide - Midterm Guide: Respiratory System

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erinmarten908
4 Apr 2016
School
University of Ottawa
Department
Anatomy and Physiology
Course
ANP 1105
Professor
Joanne Savory

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Document Summary

External intercostal muscle contract raise of ribcage. Increase in lung volume, decrease in pressure. Air rushes into the lung (diference in atmospheric pressure) Fall in lung volume, increase in pressure. Air rushes out of lung (diference in atmospheric pressure) Atmospheric pressure = pressure exerted by air around body (760mm hg at sea level; will change with elevaion of sea level) Respiratory pressure described relaive to atmospheric pressure e. g. -4mm hg respiratory pressure = 760-4 = 756mm hg. Rise & fall with breathing, but always eventually equalizes with atmospheric. Negaive pressure being a vacuum, allowing the lungs to stay in shape under change of thoracic capacity while inspir- & expiraion. ~4 mm hg less than pressure in alveoli. Surface tension of pleural luid + elasicity of chest wall. Transpleural (transpulmonary) pressure = intrapulmonary intrapleural pressure. *any condiion equalizing intrapleural pressure with intrapulmonary pressure (or atmospheric pressure.

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