Arteriole

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An arteriole is a blood vessel between artery and capillary, surrounded by smooth muscle. The arteriole is the primary site of vascular resistance.

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Cardiovascular system
Heart - Aorta - Arteries - Arterioles - Capillaries - Venules - Veins - Venae cavae - Pulmonary artery - Lungs - Pulmonary veinss - Blood