Energy Systems and Exercise Effects Quiz

Which energy system is primarily responsible for providing energy during the first 10 seconds of high-intensity exercise, such as a 100-metre sprint?

• Aerobic system

• ATP-PC system

• Lactic acid system

• Oxidative phosphorylation

What is the main by-product of the lactic acid system during intense exercise?

• Carbon dioxide

• Lactic acid

• Water

• Oxygen

Which energy system is most active during a marathon?

• ATP-PC system

• Lactic acid system

• Aerobic system

• Phosphocreatine system

During prolonged, moderate-intensity exercise, which substrate is primarily used by the aerobic system?

• Creatine phosphate

• Glycogen

• Fatty acids

• Protein

What effect does regular aerobic exercise have on the number of mitochondria in muscle cells?

• Decreases

• Increases

• No effect

• Destroys

Which of the following is a short-term effect of exercise on the energy systems?

• Increased glycogen storage

• Increased lactic acid production

• Increased mitochondrial density

• Increased capillarisation

What is the main fuel source for the ATP-PC system?

• Glucose

• Fatty acids

• Phosphocreatine

• Amino acids

Which process removes lactic acid from the muscles after exercise?

• Glycolysis

• The Cori cycle

• Lipolysis

• Hydrolysis

What is the effect of high-intensity interval training (HIIT) on the ATP-PC system?

• Decreases phosphocreatine stores

• Increases the rate of ATP resynthesis

• Reduces enzyme activity

• Decreases muscle mass

Which of the following is a long-term adaptation of the aerobic energy system to regular exercise?

• Increased lactic acid tolerance

• Increased phosphocreatine stores

• Increased capillarisation

• Decreased stroke volume