La sangre circula desde el corazón al resto del cuerpo, y de regreso al corazón. Este flujo continuo se llama circulación sanguínea . La sangre circula por los vasos sanguíneos. Estos son conductos musculares en forma de tubo. Existen 3 tipos de vasos sanguíneos.
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Las arterias transportan la sangre oxigenada desde el corazón.
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Las venas transportan sangre desoxigenada de vuelta al corazón.
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Los capilares son vasos sanguíneos muy pequeños que conectan las arterias con las venas. Los capilares tienen paredes delgadas que permiten que el oxígeno y los nutrientes pasen a través de sus paredes hacia las distintas partes del cuerpo. También permiten que los desechos de las diferentes partes del cuerpo pasen a la sangre.
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