capillarynoun · Level 2 SAT1A minute vessel having walls composed of a single layer of cellsTiny capillaries carry oxygenated blood from arteries to the cells of every organ in the body.ModuleLevel 2RegistercommonCollectionCollection 048SAT Plus planAlso in Collection 048alluvion, comparable, conducive, charlatan, benefit, bole, brae, comprehensible and 1 more