The vessels that are the main site of variable resistance in the circulatory system, and that contribute more than 60% of the total resistance, are the

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Arterioles are the vessels that are the main site of variable resistance in the circulatory system, as they have a small diameter and can constrict or dilate to regulate blood flow. They contribute more than 60% of the total resistance in the circulatory system. Muscular and elastic arteries also have some ability to change their diameter, but they account for a smaller proportion of total resistance. Venules and veins have low resistance due to their larger diameter and thinner walls.

The Vessels That Are the Main Site of Variable Resistance