Respiration 0.0 / 5 ? PharmacyRespiratory systemUniversityNone Created by: SamDaviesCreated on: 16-04-19 19:07 What is Boyle's law? P is proportional to 1/V 1 of 31 What is the volume of functional reserve capacity? 2.5 L 2 of 31 What is the name given to the amount of air still inside the lungs at equilibrium (i.e. just after expiration)? Functional reserve capacity 3 of 31 With no external forces acting on the lungs, what are they inclined to do? Collapse inwards 4 of 31 With no external forces acting on the chest wall, what is it inclined to do? Expand outwards 5 of 31 What is the value of intrapleural pressure relative to barometric pressure? -0.5 kPa 6 of 31 In order for lungs to inflate, what must happen? The pressure inside the lungs must be greater than outside of the lungs 7 of 31 At FRC, alveolar pressure is equal to barometric pressure. True or false? True 8 of 31 On a pressure-volume curve, how is compliance measured? Change in volume / change in distending pressure 9 of 31 The distending pressure of chest wall compliance is always positive. True or false? False 10 of 31 Surface tension tries to collapse alveoli. What is the role of surfactant? Disrupt surface tension 11 of 31 What is LaPlace's law? P = 2T/r 12 of 31 In the presence of surfactant, there can be equal pressures in alveoli of different sizes according to LaPlace's law. True or false? True 13 of 31 In an obstructive disease, FRC is lower. True or false? False 14 of 31 A curve combining both chest wall and compliance curves is more steep than either of the individual compliance curves. True or false? False 15 of 31 The equation for resistance is Flow = (Pa - Palv) / resistance. True or false? False 16 of 31 The site of greatest airflow resistance is the trachea and bronchi. True or false? True 17 of 31 R = 8ln/(pi x r^4). True or false? True 18 of 31 Why don't the narrow airways have a greater resistance? The total resistance of parallel airways is smaller than each of the airways individually 19 of 31 What is the resistance in obstructive disease? FEV1/FVC < 80% 20 of 31 What is the resistance in restrictive disease? FEV1/FVC > 80% 21 of 31 What is the alveolar gas equation? PAO2 = PIO2 - (PaCO2/R) 22 of 31 What do large differences (i.e. >1 kPa) between alveolar and arterial oxygen imply? Thickened diffusion barrier 23 of 31 At high altitudes, people still have a normal alveolar-arterial PO2 difference. True or false? True 24 of 31 O2 diffuses 20x more easily than CO2. True or false? False 25 of 31 It takes 0.75 seconds for blood to pass through a capillary but diffusion occurs within 0.25 seconds. True or false? True 26 of 31 Pleural pressure is more negative near the top of the lungs. True or false? True 27 of 31 A CHANGE in pleural pressure will be the same throughout the lungs. True or false? True 28 of 31 There is more ventilation of alveoli near the top of the lungs than the bottom due to a larger change in volume. True or false? False 29 of 31 How would the lungs adjust to match V/Q if V/Q was too low? Vasoconstriction 30 of 31 How would the lungs adjust to match V/Q if V/Q was too high? Bronchoconstriction 31 of 31
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