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Q1: Describe the histological parts of the blood vessels? What are the histological differences between arteries and veins?
Blood travels through the body in a continuous system of tubes. The large muscular arteries initially carry the blood away from the heart continuously becoming smaller in diameter and thinner in wall thickness. The muscular layer of the arterioles becomes thinner as the arteries become arterioles and eventually disappear altogether as the vessels become capillaries. After gas and nutrient exchange has occurred in the tissues through the thin walls of the capillaries the vessels gradually enlarge into venules and further along the vessels begin to merge into larger diameter more thickly walled veins which will carry the blood back to the heart....
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