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.
Like all extant lamnids, the Porbeagle is warm-bodied, maintaining its internal temperature 12.5 to 18 degrees Fahrenheit (7 to 10 degrees Celsius) higher than the water temperature. It has been known to leap out of the water in pursuit of prey.