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Blood flows from capillaries to venules and then to larger veins, returning to the heart. Veins are thinner and have lower pressure than arteries. They don't pulsate or spurt blood when cut. Veins have one-way flow and are more numerous than arteries. They have thin walls but can expand. Blood passes from the capillaries into venules that drain into progressively larger veins as the blood returns towards the heart. Because of the lower pressure in the venous system, veins are thinner than arteries. They do not pulsate and do not spurt blood when severed. They provide a one-way return track from the blood towards the heart and more numerous than arteries. Veins have thin walls but high expansion capacity.