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is different for each of them. It ranges from a diameter of about 30-25 millimeters for the aorta to only about 5 micrometers (0,005mm) for the capillaries. Vasoconstriction is the constriction of blood vessels (narrowing, becoming smaller in cross-sectional area) by contracting the vascular smooth muscle in the vessel walls. It is regulated by vasoconstrictors (agents that cause vasoconstriction). These can include paracrine

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