The afferent |arteriole| and efferent |arteriole| feed ~blood~ into and out of the |Bowman's capsule|. The afferent |arteriole| transports ~blood~ from the interlobular |artery| to the |capsule| to be filtered. The efferent |arteriole| transports the filtered ~blood~ from the |capsule| to the |medullary plexus|, and then to the interlobular |vein|.
