#Question id: 11075
#Unit 7. System Physiology – Animal
A 65-year-old man with emphysema due to 34 years of cigarette smoking is admitted to hospital due to dyspnea. With further tests the mean pulmonary arterial pressure is determined to be 45 mm Hg at rest. He is hypoxic (PO2 = 49 mm Hg), hypercapnic (85 mm Hg), and slightly acidotic. The cardiovascular and oxygen changes are due to which of the following?
#Question id: 11076
#Unit 7. System Physiology – Animal
Which of the following will decrease pulmonary blood flow resistance?
#Question id: 11077
#Unit 7. System Physiology – Animal
A person’s normal tidal volume is 400 ml with a dead space of 100 ml. The respiratory rate is 12 breaths/min. The person is placed on ventilator for surgery and the tidal volume is 700 with a rate of 12. What is the approximate alveolar Pco2 for this person?
#Question id: 11079
#Unit 7. System Physiology – Animal
The diffusing capacity of a gas is the volume of gas that will diffuse through a membrane each minute for a pressure difference of 1 mm Hg. Which of the following gases is often used to estimate the oxygen diffusing capacity of the lungs?
#Question id: 11080
#Unit 7. System Physiology – Animal
The O2-CO2 diagram here shows a ventilation-perfusion
ratio line for the normal lung. Which of the following best describes the
effect of decreasing ventilation-perfusion ratio on the alveolar Po2 and Pco2?
#Question id: 11081
#Unit 7. System Physiology – Animal
In which of the following conditions is alveolar Po2 increased and alveolar Pco2 decreased?