Why is more energy produced when a person is exercising?
1. There is an increase in the synthesis of protein.
2. There is an increase in the production of pyruvic acid in the cells.
3. There is an increase in the conversion of pyruvic acid to lactic acid.
4. There is an increase in the production of mitochondria in the muscle cells.
ANS: 4
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1
Protein synthesis is the function of ribosomes. An increase in the synthesis of proteins does not yield energy and is not directly related to exercise.
2
In aerobic energy metabolism, two adenosine triphosphate and pyruvic acid are produced. The increase in the production of pyruvic acid does not produce more energy.
3
Conversion of pyruvic acid to lactic acid in cellular hypoxia is noxious to cells and does not create energy.
4
Exercise stimulates an increase in the number of mitochondria formed in the muscle cells. This process leads to the conversion of oxygen into energy.
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