Physiology Questions

3) What is the limitation of the duration of activity at an intensity level of 85% to 90% Vo2max?a) Decreased heart rateb) Increased rest periodsc) Limited availability of carbohydrates from glycogen

2. What is the fuel source for high-intensity, short-duration exercise?A. FatsB. ProteinsC. CarbohydratesD. All of the above

1. When glycogen is broken down anaerobically, it is used how many times faster compared to when it is broken down aerobically?A) 5 to 6 timesB) 10 to 11 timesC) 18 to 19 timesD) 25 to 26 times

2. Which substrates can be used by the Krebs cycle during exercise?a) Proteinsb) Fatty acidsc) Carbohydratesd) Alanine and the branched-chain amino acidse) All of the above

1. What happens to the intensity of the aerobic pathway as the duration of exercise increases?a) It increasesb) It remains the samec) It decreases

2. What are the factors that contribute to the decrease in power output during prolonged exercise?a) Accumulation of lactic acid and increased availability of oxygenb) Increased availability of oxygen and decreased contribution of fatsc) Decreased availability of oxygen and accumulation of lactic acid

3. Why can only glucose and glycogen be broken down anaerobically for fuel during high-intensity, short-duration exercise?A. Oxygen is not available for anaerobic pathwaysB. Proteins are not available for breakdownC. Fats are not readily available for fuel during high-intensity exerciseD. None of the above

4. In moderate-intensity sports or exercise, such as jogging and cycling, approximately how much of the energy comes from the aerobic breakdown of muscle glycogen? A) One-quarterB) HalfC) Three-quartersD) All

1. What type of exercise is primarily fueled by the aerobic pathway?a) High-intensity exerciseb) Moderate-to-low-intensity exercisec) Anaerobic exercised) No type of exercise

4. Which process is responsible for the synthesis of glucose from the carbon skeletons of certain amino acids?a) Glycolysisb) Krebs cyclec) Gluconeogenesisd) None of the above

4. What type of exercise draws primarily on reserves of ATP and CP?a) Low-intensity exerciseb) High-intensity exercisec) Moderate-intensity exercised) None of the above

1. What are the two factors that determine the amount of ATP required to perform exercise?A. Exercise intensity and heart rateB. Exercise duration and type of exerciseC. Exercise intensity and exercise durationD. Exercise duration and rest time

5. What are the possible sources of energy for moderate-intensity athletic activities?A) Muscle glycogen onlyB) Circulating blood glucose onlyC) Both circulating blood glucose and fatty acidsD) None of the above

4. How do we categorize sporting events to determine the energy system being used to provide our bodies with ATP?A. By exercise intensity and durationB. By age and genderC. By heart rate and body weightD. By skill level and experience

1. Which of the following is a source of fuel for ATP generation and muscle contraction?a) Waterb) Vitaminsc) Protein, fat and carbohydrated) None of the above

2. High-intensity workouts or competitive races create a risk of running out of muscle glycogen before the event or exercise is done, primarily because of its __________ rate of use.A) lowB) moderateC) highD) unpredictable

5. What determines the relative rates of substrate use during exercise?a) The type of exerciseb) The intensity and duration of the exercisec) The location of the exercised) The time of day the exercise is performed

3. Sports that use both anaerobic and aerobic pathways also have a high glycogen-use rate. Give an example of a sport that falls under this category.A) SwimmingB) BoxingC) WrestlingD) Cricket

2. Why can't fatty acids supply all the ATP during high-intensity exercise?a) Fatty acids are not a good source of energyb) Fatty acids cannot be broken down fast enough to provide energyc) Fatty acids provide less energy per liter of oxygend) Fatty acids are used up quickly during high-intensity exercise

3. What is restricted to glucose in the glycolytic pathway?a) Fatb) Proteinc) Carbohydratesd) Water