Study_Guide_for_Lectures_9_to_15_2013.doc

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Department
Biological Sciences
Course
BIOC34H3
Professor
Stephen Reid
Semester
Winter

Description
1BGYC33CC4 Respiratory System Study Guide Lectures 915 2013Lecture 9 Pulmonary MechanicsTopicsThe Respiratory TractConducting Zone Respiratory ZoneBlood Flow to the LungsThoracic Cavity and Respiratory MusclesDiaphragm Intercostal Muscles Abdominal Muscles Chest Wall Phrenic NerveInspirationExpirationThe PleuraParietal Pleura Visceral Pleura Pleural Space Pulmonary PressuresAtmospheric Pressure P Alveolar Pressure P Intrapleural Pressure PatmalvipImportant Pressure DifferencesP PDriving force for air flow in and out of the lungsatm alvP PTranspulmonary Pressure drives lung expansionalv ipDamage to the PleuraPleural SpacePneumothoraxTension PneumothoraxHaemothoraxPleural EffusionAsbestosisAir Flow In and Out of the LungsLung Compliance2Sample Questions1 Transpulmonary pressure isa PP and the driving force for airflow in and out of the lungsatmipb PP and the driving force for lung expansionatmipc P Pand the driving force for lung expansionalvip d P Pand the driving force for airflow in and out of the lungsalvip e P Pand increased by a pneumothoraxalvip 2 In the diagram below P relative to P the upper trace decreases in the part of the curve alvatmlabeled A because the X while lung pressure decreases in area labeled E because Ya Xlung volume decreases Ythe number of molecules of air in the lungs decreasesb Xdiaphragm contracts Ythe number of molecules of air in the lungs decreasesc Xlung volume decreases Ythe number of molecules of air in the lungs increasesd Xlungs expand Ythe number of molecules of air in the lungs decreasese Xlung volume increases Ythe diaphragm relaxesCDEAB3 During inspiration transpulmonary pressure because the decreasein is greater than the decrease ina Increases intrapleural pressure alveolar pressureb Decreases intrapleural pressure alveolar pressurec Increases alveolar pressure intrapleural pressured Decreases alveolar pressure intrapleural pressuree Increases atmospheric pressure intrapleural pressure
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