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 flow of energy in an ecosystem is unidirectional and is not cyclic. It is represented in a flowchart form. The flow of nutrients in an ecosystem is cyclic like a water cyâ¦cle. An example for flow of energy is :- sun --- producer --- primary consumer --- secondary consumer --- tertiary consumer --- decomposer.