PSL 372 Practice Questions with Correct Answers

what are the three stages of respiration ventilation, gas exchange, O2 utilization dry air PO2 -- alveolar PO2 -- arterial PO2 -- Cellular PO2 -- venous PO2 149 mmHg -- 100 mmHg -- 100 mmHg -- 40 mmHg -- 40 mmHg cellular PCO2 -- venous PCO2 -- alveolar PCO2 -- dry air PCO2 -- arterial PCO2 46mmHg -- 46mmHg -- 40 mmHg -- 0.25mmHg -- 40mmHg compare type I and type II alveolar cells Type I = structural support, type II = surfactant secretion What is the composition of surfactant? phospholipids What is compliance? When does it reduce? ease of lung to stretch/expand = distensibility reduced by factors that produce resistance to distension What is elasticity? How does it increase? the tendency to return to initial size after distension increases with elastin proteins and surface tension What are: VT IRV ERV RV IC FRC VC TLC FVC FEV1 FEV3 VT = tidal volume IRV = Inspiratory reserve volume ERV = Expiratory reserve volume RV = Residual volume IC = Inspiratory Capacity = VT + IRV