Energy Systems in Human Exercise

What is the primary function of the phosphocreatine energy system in the body?

• To produce lactic acid

• To provide immediate energy for short bursts of activity

• To support long-duration aerobic activities

• To store oxygen in muscles

Which of the following is a byproduct of the lactic acid energy system?

• Carbon dioxide

• Water

• Lactic acid

• Creatine phosphate

During aerobic respiration, which molecule is primarily used to produce ATP?

• Glucose

• Creatine

• Lactic acid

• Nitrogen

What role does ATP play in exercise?

• It acts as a waste product

• It provides energy for muscle contractions

• It stores oxygen in the blood

• It breaks down proteins

Which of the following is a common cause of muscle fatigue during high-intensity exercise?

• Excess oxygen

• Depletion of phosphocreatine

• Increased blood sugar

• High levels of creatine

How does the body primarily recover from the build-up of lactic acid after exercise?

• By converting it back to glucose in the liver

• By storing it in fat cells

• By excreting it through sweat

• By using it to build muscle

Which of the following best describes the aerobic energy system?

• It operates without oxygen

• It is used for short, explosive movements

• It relies on oxygen to produce ATP

• It produces energy solely from protein

What is the primary source of energy for the phosphocreatine system?

• Fatty acids

• Creatine phosphate

• Glycogen

• Amino acids

Which process is responsible for the production of ATP in the aerobic energy system?

• Glycolysis

• Krebs cycle and electron transport chain

• Fermentation

• Phosphorylation

What is a common recovery mechanism after prolonged aerobic exercise?

• Consuming high-fat foods

• Rest and rehydration

• Increasing lactic acid production

• Reducing oxygen intake