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 .

two capillary beds

Explanation:

Here is the complete question:.

a human red blood cell in an artery of the left arm is on its way to deliver oxygen to a cell in thumb. to travel from the artery in the arm to the left ventricle, this red blood cell must pass through

a. one capillary beds

b. two capillary beds

c. three capillary beds

d. four capillary beds

e. five capillary beds

The answer is

b. two capillary beds

because of

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