As we mentioned above, ATP is a free energy molecule. Free energy (from chemical conversion of carbon dioxide and oxygen into ATP) is used in most all biological processes which depend on the energy of an external source.
The main energy used in the body is carbohydrate. This is due to the fact that as the body burns carbohydrates for energy, it requires an increased supply for this energy.
The amount of carbohydrates in the blood is regulated via the liver. After a meal, when glucose levels are highest, the liver produces more glucose, and when glucose levels drop, the liver produces less glucose. Thus the amount of blood glucose changes during the day by approximately 0.1 to 0.2 mg/dL (0.01 to 0.02 mmol/L).
As the body uses and burns carbohydrates during the day, the balance between carbohydrates and glucose changes in the body.
The liver must balance these different needs. The liver produces and consumes glucose in amounts sufficient to maintain energy requirements during the day. When the liver needs to take more glucose from other sources than glucose, such as fat, it must increase the amount of glucose stored in the liver.
When this extra glucose is used by the body after a meal, it may result in an increase in the amount of ATP stored in the cell. More ATP is available to the cell because more glucose is available for use.
Exercise promotes ATP production
This mechanism that ATP is required for has been established to be essential for muscle contraction. Exercise is the main stimulus that causes cells to produce ATP.
When you press a button and your muscles contract, the mitochondria, which are the main sources of ATP, start to produce it. In fact, the amount of ATP that the body can store during short periods of time is controlled by the muscle contractile response. So after completing a moderate exercise in the gym, the mitochondria produce an additional 50-75% of their maximal ATP capacity (remember, muscle doesn’t like to rest).
Although a moderate exercise can still help to maintain your fitness, you will be using your muscles only for a short period of time, until you have recovered enough from your workout to get into a run or walk again. In addition, muscle fatigue often occurs at a point where you haven’t been able to increase your level of activity, which can lead to a reduction in muscle performance.
By increasing the type of exercise you do, you can prevent some of this short-term fatigue
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