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.
The Gulf Stream, also known as the North Atlantic Drift, is a warm current which flows across the Atlantic Ocean from the warmer seas of the Caribbean and makes West-European countries considerably warmer than they would be otherwise. The Gulf Stream is the main ocean current that affects Britain and warms it by 5-8C. The Gulf of Mexico has higher air temperatures than Britain, as it's closer to the equator. This means that the air coming from the Gulf of Mexico to Britain is also warm. However, the air is also quite moist as it travels over the Atlantic Ocean.