VASODILATION and VASOCONSTRICTION | 

Vessels transport nutrients to organs/tissues and to transport wastes away from organs/tissues in the blood.
when blood vessels in your body widen, allowing more blood to flow through them and lowering your blood pressure.
Vasodilation occurs naturally in response to low oxygen levels or increases in body temperature. Its purpose is to increase blood flow and oxygen delivery to parts of the body that need it most.
Vasoconstriction is the narrowing of blood vessels, typically when the muscles of blood vessel walls become constricted, causing the vessel lumen to become smaller. Vasoconstriction can be a reaction to cold, stress, cigarette smoking, medications
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