Under quiet conditions,blood returning to the heart retains about ________ of its oxygen content when it leaves the lungs.
A)25 percent
B)50 percent
C)75 percent
D)90 percent
E)100 percent

Question

Quizplus · Accepted Answer

Under quiet conditions, blood returning to the heart retains about 75 percent of its oxygen content after leaving the lungs, as it delivers only about 25 percent of its oxygen to the tissues.

Under Quiet Conditions,blood Returning to the Heart Retains About ________