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.
These loops are known as mesoscale eddies. These features are important because they are hot  spots of intense biological and physical activity. Metr 201 Link to Scales of Circulation. Figure 1. Two eddies (identified by the circles, one warm (red) and one cold (blue) within the Gulf Stream.CYCLONIC AND ANTICYCLONIC EDDIES. If the buoy indicates that the ocean moves in a counterclockwise direction in the northern hemisphere, that loop is called a cyclonic eddy.The center of the eddy is likely cooler and lower in height (by a few tens of centimeters) than the outer lying waters.wo eddies (identified by the circles, one warm (red) and one cold (blue) within the Gulf Stream. CYCLONIC AND ANTICYCLONIC EDDIES. If the buoy indicates that the ocean moves in a counterclockwise direction in the northern hemisphere, that loop is called a cyclonic eddy.