You conduct a study with mice to determine whether giving them air with a higher-than-normal oxygen level results in their having a higher-than-normal oxygen content in their blood. What vessel should you draw blood from if you want to measure the highest potential level of oxygen content in the blood?
A) superior vena cava
B) pulmonary vein
C) pulmonary artery
D) inferior vena cava

Question

Quizplus · Accepted Answer

The pulmonary vein is the vessel that brings oxygenated blood from the lungs back to the heart. Drawing blood from this vessel will provide an accurate measure of the oxygen content in the blood, as it has just been oxygenated in the lungs. The other vessels listed either carry deoxygenated blood (inferior vena cava) or mix oxygenated and deoxygenated blood (superior vena cava, pulmonary artery) before reaching the heart, so they would not provide the highest potential level of oxygen content in the blood.

You Conduct a Study with Mice to Determine Whether Giving