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 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 four capillary beds one capillary bed three capillary beds

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:

Capillary beds are the netwrok of capillaries present in all tissues of body. They are the sites of diffusion and exchange of material within the body (oxygen, CO2 , glucose etc)

As the humad red blood cell travels from the artery of left arm to thumb, it passes through one capillary -bed as it has to supply oxygen to  a cell in thumb and as it moves through the artery back to the left ventricle, it again pass through another capillray-bed.

Hence the Red blood cell will pass through two capillary beds.

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explanation:

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