Energy Systems in Exercise

What is the role of adenosine triphosphate (ATP) in the human body?

• D. It is involved in the breakdown of glucose

• C. It is used for long-duration, low-intensity activities

• B. It is the only immediately available source of energy for muscular contraction

• A. It is a waste product of metabolism

Which energy system is predominant during very high-intensity activities lasting 2-10 seconds?

• C. ATP-PC system

• B. Aerobic system

• A. Glycolytic system

• D. Anaerobic glycolysis

What is the by-product of anaerobic glycolysis?

• D. ATP

• C. H2O

• B. CO2

• A. Lactic acid

Which energy system is predominant during high-intensity activities lasting 10 seconds to 3 minutes?

• C. Anaerobic glycolysis

• B. Aerobic system

• D. Kreb's cycle

• A. ATP-PC system

What is the overall energy yield of the electron transport chain (ETC) in the aerobic system?

• D. 34 moles of ATP

• B. 4 moles of ATP

• A. 2 moles of ATP

• C. 30 moles of ATP

Which energy system is predominant during low to moderate-intensity activities lasting more than 3 minutes?

• C. Anaerobic glycolysis

• B. Glycolytic system

• A. ATP-PC system

• D. Aerobic system

What is the relative contribution of the aerobic system to overall energy production during a marathon?

• C. 90%

• B. 75%

• D. 99%

• A. 50%

What type of exercise is more energy demanding than continuous exercise when the mean running speed is the same?

• C. Low-intensity exercise

• A. Continuous exercise

• B. High-intensity exercise

• D. Intermittent exercise

What is the product of anerobic glycolysis?

• B. CO2

• D. ATP

• A. Lactic acid

• C. H2O

What is the primary fuel used in the aerobic system for long-duration, low-intensity activities?

• A. Glucose

• C. Triglycerides

• B. Phosphocreatine

• D. ATP