The material present in arterioles which is absent in capillaries is : ( D ) Circular smooth muscle cells that can alter the size of the arterioles
Capillaries are the connecting vessels between arteries and veins in the circulatory system, they allow the free flow of nutrients through their thin walls in and out of tissue cells.
They cannot alter their sizes because of the absence of circular smooth muscle cells that is present in arterioles.
Hence we can conclude that material which is absent in capillaries is  Circular smooth muscle cells that can alter the size of the arterioles.
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