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.
Take Hot-Cold C0ntrast Showers. Contrast showers are showers that alternate between hot and cold water. When cold water is running, the lymph vessels contract, and when hot water is running, they dilate. This creates a pump effect that contributes to increased lymph drainage and blood flow in the veins.