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veins need valves to create pressure to pump the blood to the heart. valves assist in returning venus blood to the heart.
why are valves present in veins but not in arteries
muscular pump (milking action of skeletal muscle) and respiratoy pump (thoraxic cavity pressure)
name two events occurring within the body that aid in venous return
because arteries are closer to the pumping action of the heart, their walls must be strong enough to take the changes in pressure.
why are the walls of arteries proportionately thicker than those of the corresponding veins
an arterial trunk that has three major branches, whic run to the liver, spleen and stomach
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