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Capillaries

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Capillaries
The smallest arteries which, in the lung, are located next to the alveoli so that they can pick up oxygen from inhaled air.

capillaries (kapˑ··ler·ēz),
n.pl small, thin-membraned, permeable blood vessels that link arterioles and venules, feeding and removing wastes from the tissues through which they pass.
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These capillaries actually "leak" blood that begins to oxidize (through a process called hemoglobin degradation) .
Blood vessel forming cells, known as endothelial cells, migrate into this matrix and the stimulating factors from macrophages cause these endothelial cells to divide and begin forming rudimentary capillaries then capillary loops.
This instinct for the capillaries recently found expression in a lawsuit by the ACLU of West Virginia to permit hunting on Sundays.
 
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