1. A human red blood cell in an artery of the left arm is on its way to deliver oxygen to a cell in the thumb. To travel from the artery to the thumb and then back to the left ventricle, this red blood cell must pass through _______ .
(A) one capillary bed
(B) two capillary beds
(C) three capillary beds
(D) four capillary beds
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統計: A(0), B(1), C(0), D(0), E(0) #3979924
統計: A(0), B(1), C(0), D(0), E(0) #3979924