In Afghanistan, the US-led international force still occupies more than 450 bases. In total, the US military has some form of troop presence in approximately 150 foreign countries, not to mention 11 aircraft carrier task forcesâessentially floating basesâand a significant, and growing, military presence in space.
Metabolism is the set of chemical reactions that occur in living organisms in order to maintain life. These processes allow organisms to grow and reproduce, maintain their structures, and respond to their environments.
We often blame metabolism for these two phenomena. Yet the concept of metabolism is one that is poorly understood by many. In this lesson we'll discuss the processes involved in metabolism and what it means for health and well-being. Metabolism is defined as the sum of all of the chemical reactions within the body. This includes any chemical process by which a substance is broken down, produced, or chemically modified. Metabolism is often described in terms of food and nutrient use within the body, primarily because it is simpler to understand.