A research scientist attempts to understand the influence of carbon dioxide content in blood on its oxygen binding. The scientist adds carbon dioxide to dog blood and measures the uptake of oxygen in the blood versus oxygen pressure in the peripheral tissue. He notes in one dog that with the addition of carbon dioxide with a pressure of 90 mmHg, the oxygen pressure in the peripheral tissue rose from 26 to 33 mmHg. How can this phenomenon be explained?
AHigh partial pressure of CO2 in tissues decreases peripheral blood volume
BBinding of O2 to hemoglobin in lungs drives release of CO2 from hemoglobin
CHigh partial pressure of CO2 in tissues causes alkalemia, which is necessary for O2 unloading
DHigh partial pressure of CO2 in tissues facilitates O2 unloading in peripheral tissues
EThe sum of the partial pressures of CO2 and O2 cannot exceed a known threshold in blood
A 24-year-old professional athlete is advised to train in the mountains to enhance his performance. After 5 months of training at an altitude of 1.5 km (5,000 feet), he is able to increase his running pace while competing at sea-level venues. Which of the following changes would produce the same effect on the oxygen-hemoglobin dissociation curve as this athlete's training did?
ADecreased 2,3-bisphosphoglycerate
BIncreased carbon monoxide inhalation
CDecreased temperature
DDecreased pH
EIncreased partial pressure of oxygen
A 21-year-old man presents to his physician because he has been feeling increasingly tired and short of breath at work. He has previously had these symptoms but cannot recall the diagnosis he was given. Chart review reveals the following results: Oxygen tension in inspired air = 150 mmHg Alveolar carbon dioxide tension = 50 mmHg Arterial oxygen tension = 71 mmHg Respiratory exchange ratio = 0.80 Diffusion studies reveal normal diffusion distance. The patient is administered 100% oxygen but the patient's blood oxygen concentration does not improve. Which of the following conditions would best explain this patient's findings?
ASeptal defect since birth
BUse of opioid medications
CPulmonary fibrosis
DPulmonary embolism
EVacation at the top of a mountain
+ 7 more in the PDF
Browse all chapters