Greenish urine can mean that you have a urinary tract infection but if it's bright green, it can mean that you have too much of B vitamins. Certain drugs and some health conditions can cause urine to turn green, too, so mention this to your health care professional.
Alcohol does this by interacting with the receptors on the receiving cells in these pathways. Alcohol affects various centers in the brain, both higher and lower order. The centers are not equally affected by the same BAC -- the higher-order centers are more sensitive than the lower-order centers. As the BAC increases, more and more centers of the brain are affected. The order in which alcohol affects the various brain centers is as follows: Cerebral cortex.
Although GABA activity doesn't entirely explain alcohol's effects and we don't know exactly what the delta receptor does, a big part of the mystery seems to have come unraveled. Because GABA is the primary inhibitory neuron in the brain, it can affect virtually every system. Alcohol is more than simply a depressant. The physical structure of the brain remains constant, but the addition of a tiny chemical drastically alters brain function and ultimately behavior. Understanding how alcohol affects our brain also offers insight into how our brains work in general. So the next time you drink, even though you may be killing some valuable brain cells, you can toast to the fact that you're contributing to neuroscience. Notes: Giancola PR, Zeichner A. The biphasic effects of alcohol on human physical aggression. J Abnorm Psychol. 1997 Nov;106(4):598-607. McDougle CJ, Krystal JH, Price LH, Heninger GR, Charney DS.