Blood vessels inside the living organisms are responsible for making a delivery system inside the body of an organism. Three major type of blood vessels present in the body are the arteries, the capillaries, and the veins. The arteriolar system carries the blood away from the heart and the veins carry blood toward the heart inside the body. The contraction and relaxation of the blood vessels result in the increased or decreased amount of surface area of the blood vessels.

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Chapter 19, Problem 5RQ

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Blood vessels inside the living organisms are responsible for making a delivery system inside the body of an organism. Three major type of blood vessels present in the body are the arteries, the capillaries, and the veins. The arteriolar system carries the blood away from the heart and the veins carry blood toward the heart inside the body. The contraction and relaxation of the blood vessels result in the increased or decreased amount of surface area of the blood vessels.

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