As soon as alcohol is introduced to the blood-stream, it crosses the blood- brain barrier. The blood-brain barrier is a highly selective semi-permeable membrane barrier that separates the circulating blood from the brain, and thus preventing many toxins from entering the brain. It, however, can not prevent alcohol from entering the brain, so the brain alcohol level quickly equalizes to the blood alcohol level. Alcohol has the potential to affect the entire brain, all at once. It interferes with the actions of various neurotransmitters in the brain. Neurotransmitters are the chemicals which are present in the neurons by which signals from the brain are transmitted to the target organ. There are essentially two types of neurotransmitters - one which transmits a signal to increase the target organ’s activity (known as ‘excitatory’ neurotransmitter) , and another which transmits a signal to decrease the target organ’s activity (known as ‘inhibitory’ neurotransmitter). Now, when ...