According to the Fick principle, if O2 consumption remains constant, an increase in cardiac out-put will manifest itself as which of the following?
a. Decrease in the CaO2 CO2.
b. Increase in the CaO2.
c. Increase in the CaO2 CO2.
d. Decrease in the CO2.
Q. 2 At body temperature, how much O2 will physically dissolve in plasma at a PO2 of 40 mm Hg?
a. 0.12 ml/dl
b. 0.20 ml/dl
c. 0.30 ml/dl
d. 1.34 g/dl
Q. 3 Under normal physiologic circumstances, how many milliliters of O2 are capable of combining with 1 g of Hb?
a. 0.003 ml
b. 0.450 ml
c. 0.820 ml
d. 1.340 ml
Q. 4 Given the following blood parameters, compute the total O2 content (dissolved + HbO2) of the blood in ml/dl: Hb = 18; PO2 = 40 mm Hg; SO2 = 73.
a. 16.5 ml/dl
b. 17.7 ml/dl
c. 18.6 ml/dl
d. 19.5 ml/dl
Q. 5 At a PaO2 of 65 mm Hg, what is the approximate saturation of Hb with O2?
a. 73
b. 80
c. 90
d. 97
Q. 6 If the total hemoglobin content (Hb + HbO2) of a sample of blood is 20 g/dl and the oxyhemo-globin (HbO2) content is 15 g/dl, what is the HbO2 saturation?
a. 17
b. 50
c. 75
d. 83
Q. 7 Why is it necessary to keep the patient's PaO2 greater than 60 mm Hg?
a. A level of 60 mm Hg marks the beginning of the steep part of O2Hb dissociation curve.
b. Below the 60 mm Hg level, tissue hypoxia is ensured.
c. Oxygen deprivation will cause severe cer-ebral vasoconstriction below 60 mm Hg.
d. The PaCO2 will start to rise precipitously if the PaO2 falls further.
Quick Reply
