TCM can be explained through western means, but it's just steeped in old-world terminolgy. It also doesn't help that it's a b!tch to define qi.
Meridian lines - as I understand it - are not part of actual TCM but were essentially made up something like 200 years ago by a westerner. How it came to be accepted as fact, I do not know.
See this thread: http://kungfuqigong.com/forum/showthread.php?t=65979
it may help.