Topic 1 : Basic Energy Systems Quiz

Which of the following is the primary fuel for the body's energy needs during exercise?

• Protein

• Fat

• Carbohydrates

• Vitamins

Answer explanation

Carbohydrates are the main fuel for the body during physical activity, as they are quickly converted into glucose for energy.

What is the process of breaking down food sources to transfer energy to ATP called?

• Hydrolysis

• Phosphorylation

• Glycolysis

• Lipolysis

Answer explanation

Phosphorylation is the process through which energy from food is transferred to ATP.

What is the storage form of glucose in the muscles and liver?

• Fatty acids

• Amino acids

• Glycogen

• Triglycerides

Answer explanation

Glycogen is stored in the liver and muscles as the body's backup energy source for quick conversion to glucose.

Which compound is the most immediate source of energy for muscle contraction?

• ADP

• ATP

• Phosphocreatine

• Glucose

Answer explanation

ATP (adenosine triphosphate) is the molecule that muscles use directly for energy.

The ATP-PCr energy system is primarily used for which type of exercise?

• Marathon running

• Long-distance cycling

• 100-meter sprints

• Weightlifting

Answer explanation

The ATP-PCr system is used for short, explosive activities like sprinting.

How long does the ATP-PCr system typically provide energy during exercise?

• 1-2 minutes

• 10-15 seconds

• 3-4 minutes

• 30 seconds

Answer explanation

The ATP-PCr system provides energy for short bursts, typically lasting between 10-15 seconds.

Which of the following is a by-product of anaerobic glycolysis?

• Water

• Carbon dioxide

• Lactic acid

• Oxygen

Answer explanation

Anaerobic glycolysis produces lactic acid, which can lead to muscle fatigue.

What happens when the body runs out of phosphocreatine during high-intensity exercise?

• The body stops functioning

• The body switches to the glycolytic system

• Muscles begin to cramp

• Energy is produced without ATP

Answer explanation

Once phosphocreatine is depleted, the body transitions to using the glycolytic (lactic anaerobic) system.

What is the role of lactate during high-intensity exercise?

• It provides energy directly to muscles

• It causes muscle contraction

• It removes excess hydrogen ions from muscles

• It inhibits energy production

Answer explanation

Lactate helps transport hydrogen ions from muscles to prevent excess acidity.

Which process generates the most ATP?

• ATP-PCr system

• Glycolysis

• Oxidative phosphorylation

• Phosphorylation

Answer explanation

Oxidative phosphorylation, part of the aerobic energy system, produces the most ATP.