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As blood moves away from the heart, its size and elasticity change gradually. This helps regulate blood flow to different parts of the body based on the circumstances. Medium-sized arteries like the femoral or brachial can constrict to regulate body temperature when we adapt to environmental changes. There is a gradual change in size and elasticity as we move away from the heart, which allows blood flow to be regulated to different parts of the body by circumstance. For example, basal constriction of the medium-sized arteries, such as the femoral or brachial, allow for the thermal regulation as we adapt to environmental changes.