Leaders are made. It counts as to what one endures, learns and the decisions they make throughout there lives that determine whether they are the Shepard leading the sheep or just another sheep falling in with the herd.
The correct answer is the BBB.
The BBB is the blood brain barrier and alcohol is able to cross this barrier and reach brain cells which has negative effects on the body. Once alcohol reaches the brain cells it attacks them and as a result the central nervous system (CNS) is affected and changes in cognition and coordination take place.