Blood animation?

how would I best go about animating blood going through a blood vessel? Lots of blood cells traveling through? Paths? copying ipos?

Try using Dupliverts on simple red blood cells in a particle system and use the deflect tool in the artery for a desired effect.

… or that’s what I’d do.

I think your in the wrong forum but, curve path, or particle defectors like sk8er said, just keep the deflector as low poly as possible, cause particles hjave a habit of shooting off randomly on edges.