Energy - Movement requires , Open system - Blood is not enclosed in blood vessels, Closed system - Blood is always contained within vessels, Arteries - Carrying blood away from the heart, Veins - Carrying blood towards the heart, Arterioles - A small branch of an artery leading into capillaries, Vasoconstriction - Smooth muscle to contract, Vasodilation - Blood vessels in your body widen,, Semilunar valves - Which prevent the flow of blood back into the heart., Capillaries - Fine branching blood vessels that form a network between the arterioles and venules.,

Transport in mammals - Wordsearch

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