(a.) Shaped like a whiplash; long, slender, round, flexible, and tapering.

aorta arterial arteriole artery blood vessel bristlelike carotid cirrose cirrous fibered fibroid fibrous flagelliform flossy funicular gossamery hairlike hairy jugular vein ligamental portal vein pulmonary artery pulmonary vein ropy silky stringy taeniate taeniform threadlike thready vascular vein veinlet veinous vena cava venation venose venous venule vesicular wiry