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.
Capillary bed is a network of capillaries present in our human body which formed by the true capillaries and vascular shunts.
Capillary beds allows the exchange of the water, oxygen and other things present in the tissues.
Capillary beds are often located to metabolic organs, such as the lungs, kidneys, or brain, to exchange vital materials and rid waste.
As the human 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.
It moves through the vein back to the left ventricle, it again pass through another capillary bed.
Thus, the red blood cells pass through two capillary beds.
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