Calcium is unique among metals because its ions have a very large concentration gradient across the plasma membrane of all cells, from 10 â3 M Ca 2+ outside, to 10 â7 M Ca 2+ inside.
Originally Posted by Quinne. I think it has a lot to do with motives.... What I learned through studying Alcohol & other Drug work is that in counselling terms, a lapse is a hiccup and a relapse is full-blown return to old behaviours, as well as active addiction.
1 Brain changes that occur over time with drug use challenge an addicted personâs self-control and interfere with their ability to resist intense urges to take drugs. This is why drug addiction is also a relapsing disease.  Relapse is the return to drug use after an attempt to stop.