A blood alcohol concentration (BAC) or blood alcohol level (BAL) reflects the amount of alcohol in the body. Food, type and quantity of beverage, weight, sex, and rate of elimination determine the BAC after the consumption of alcohol.
The process of oxygen transfer in the gills of a fish is a good example of the benefits of countercurrent exchange. As oxygen poor blood meets an opposed flow of oxygen rich water, the oxygen begins to diffuse out of the water and into the blood stream.
In the western Pacific the countercurrent is centered near 5Â°N while in the central Pacific it is located near 7Â°N. The northern boundary of the Pacific NECC is easily defined by the adjacent westward flow found in the North Equatorial Current (NEC). The southern boundary, however, can be more ambiguous.