An area of the lung has no ventilation but is normally perfused by the pulmonary circulation. Which of the following statement(s) is/are correct?
1. Blood exiting the pulmonary capillary will have a PO2 = 40 and a PCO2 = 46.
2. The area represents an alveolar shunt.
3. The is 0.
a. 2 and 3 only
b. 1 and 3 only
c. 2 only
d. 1, 2, and 3
Q. 2 Regarding pulmonary blood flow in the upright lung, which of the following statements is true?
a. The apexes receive approximately 20 times more blood flow than the bases.
b. The bases receive approximately 20 times more blood flow than the apexes.
c. The greatest blood flow is found at the apexes of the lungs.
d. The pulmonary circulation is a high-pressure system.
Q. 3 What is the normal range of PAO2 PaO2 for healthy young adults breathing room air?
a. 5 to 10 mm Hg
b. 10 to 20 mm Hg
c. 20 to 30 mm Hg
d. 50 to 60 mm Hg
Q. 4 In order to assess the events occurring at the tissue level, especially tissue oxygenation, what pa-rameter would you sample and measure?
a. Coronary sinus blood
b. Left-sided heart blood
c. Systemic arterial blood
d. Systemic mixed venous blood
Q. 5 What is the primary factor that maintains the pressure gradient that drives O2 from the capillaries into the interstitial spaces and into the cells?
a. Bohr effect on the RBC
b. Cellular consumption of O2
c. Haldane effect on the RBC
d. Increased carbon dioxide in blood de-creasing Hb affinity for O2
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