Arteries, High-pressure vessels that transport oxygenated blood away from the heart to the body tissues., Arterioles, Smallest branches of arteries that deliver blood to capillaries and regulate blood pressure., Capillaries, Microscopic, thin-walled vessels where the exchange of oxygen, nutrients, and waste occurs., Venules, Small vessels that gather blood from the capillaries and join together to form veins., Veins, Low-pressure vessels that return deoxygenated blood toward the heart, often containing valves., Aorta, The largest artery in the body, originating from the left ventricle of the heart., Vena Cava, The largest veins (superior and inferior) that return blood into the right atrium., Pulmonary Arteries, The only arteries that carry deoxygenated blood; they transport blood to the lungs., Pulmonary Veins, The only veins that carry oxygenated blood; they return blood from the lungs to the heart., Lumen, The hollow internal space or channel within a blood vessel through which blood flows., Tunica Media, The middle layer of a blood vessel wall, composed of smooth muscle and elastic tissue., Valves, Flap-like structures in veins that prevent the backflow of blood due to gravity., Vasoconstriction, The narrowing of the blood vessel lumen, which increases blood pressure., Vasodilation, The widening of the blood vessel lumen, which decreases blood pressure.The specialized epithelial tissue that lines the entire inner surface of the vascular system.The narrowing of the blood vessel lumen, which increases blood pressure., Endothelium, The specialized epithelial tissue that lines the entire inner surface of the vascular system., Anastomosis, A surgical or natural connection between two blood vessels or tubular structures..

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