A Researcher Is Conducting an Experiment to Determine Factors Affecting

A researcher is conducting an experiment to determine factors affecting vascular resistance.  Experiment animals are anesthetized, intubated, and attached to a controlled ventilation system.  A catheter is placed into a small artery in various organs in each animal.  The catheter is connected to a manometer for recording pressure and to an oximeter for continuous recording of oxygen saturation.  The fraction of inspired oxygen is gradually changed, and arteriolar resistance is calculated from the manometer readings at regular intervals.  The results shown below were most likely obtained from which of the following organs?

A) Brain
B) Heart
C) Kidneys
D) Lungs
E) Small intestine

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