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1 | |
During heavy exercise, the body's total energy expenditure may increase by |
| | A) | twice that at rest. |
| | B) | 15 to 25 times that at rest. |
| | C) | 200 times that at rest. |
| | D) | none of the above |
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2 | |
Which of the following groups of activities use energy derived predominantly from the ATP-PC system? |
| | A) | golf swing, tennis serve, 400m swim |
| | B) | 400m sprint, 50m swim, triple jump |
| | C) | gymnastics vault, softball pitch, high jump |
| | D) | 1500m swim, 5000m run, 90 min. soccer match |
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3 | |
The upward drift of VO2 during steady state exercise is primarily due to |
| | A) | rising blood levels of hormones. |
| | B) | decreasing blood levels of hormones. |
| | C) | increasing body temperature. |
| | D) | decreasing body temperature. |
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4 | |
The physiological factors that influence VO2max are |
| | A) | the delivery of oxygen to the muscle. |
| | B) | the uptake of oxygen by the muscle. |
| | C) | genetics and exercise training. |
| | D) | all of the above. |
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5 | |
A factor that contributes to excess post exercise oxygen consumption is |
| | A) | decreased body temperature. |
| | B) | resynthesis of creatine phosphate in muscle. |
| | C) | glycolysis. |
| | D) | none of the above. |
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6 | |
A rise in blood lactic acid concentration can occur due to |
| | A) | an excess O2 available in the mitochondria. |
| | B) | an increase in lactic acid production. |
| | C) | a decrease in lactic acid removal. |
| | D) | both b and c. |
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7 | |
During low intensity exercise (i.e., >30% VO2max), the primary fuel source for muscle is |
| | A) | proteins. |
| | B) | carbohydrates. |
| | C) | fats. |
| | D) | glucose. |
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8 | |
As exercise increases in intensity, there is a shift from fat to metabolism. |
| | A) | protein |
| | B) | carbohydrate |
| | C) | glycerol |
| | D) | aerobic |
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9 | |
The shift from fat to carbohydrate metabolism is regulated by |
| | A) | the type of fiber recruited. |
| | B) | the level of epinephrine. |
| | C) | the size and number of mitochondria. |
| | D) | both a and b. |
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10 | |
The primary determinant of the substrate used during exercise is |
| | A) | the type of muscle cell. |
| | B) | the availability of the fuel. |
| | C) | hormone levels. |
| | D) | none of the above. |
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11 | |
Most of the carbohydrate used as a substrate during exercise comes from |
| | A) | liver glycogen. |
| | B) | muscle glycogen. |
| | C) | fat oxidation. |
| | D) | blood glucose. |
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12 | |
During the first hour of submaximal prolonged exercise, most of the carbohydrate metabolized comes from |
| | A) | liver glycogen. |
| | B) | muscle glycogen. |
| | C) | fat oxidation. |
| | D) | blood glucose. |
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13 | |
The mobilization of free fatty acids into the blood is inhibited by |
| | A) | insulin. |
| | B) | glycogen. |
| | C) | lactic acid. |
| | D) | both a and c. |
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14 | |
Fatigue results after depletion of carbohydrate stores due to the reduction |
| | A) | in the muscle concentration of pyruvic acid. |
| | B) | of Krebs cycle intermediates. |
| | C) | of Krebs cycle activity. |
| | D) | of all of the above. |
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15 | |
The portion of the oxygen debt that is responsible for the conversion of lactic acid to glycogen is around |
| | A) | 10%. |
| | B) | 20%. |
| | C) | 30%. |
| | D) | 40%. |
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