PE ATP

What is the primary role of ATP in muscle cells?

• Powering muscle contractions
• Transporting oxygen
• Creating fat stores
• Cooling the body
• Storing glycogen

Answer explanation

ATP is the energy currency used to power cell activities like muscle contraction.

How long can stored ATP fuel maximal effort before it needs to be resynthesised?

• 1–2 seconds
• 10 seconds
• 30 seconds
• 5 minutes
• 1 hour

Answer explanation

The body only stores enough ATP for 1–2 seconds of maximal intensity effort.

What happens when ATP is broken down during exercise?

• It releases energy
• It cools the muscle
• It builds protein
• It stores fat
• It releases oxygen

Answer explanation

ATP breaks down into ADP and Pi, releasing energy for muscle work.

What does ATP stand for?

• Adenosine triphosphate
• Amino triphosphate
• Adenosine trisugar phosphate
• Acetyl tri-phosphate
• Adeno tri-P

Answer explanation

ATP stands for Adenosine triphosphate, the molecule that stores energy.

What is the name of the by-product formed when ATP loses a phosphate?

• ADP
• ATP2
• AMP
• Glycogen
• FAD

Answer explanation

When ATP loses a phosphate group, it becomes ADP (adenosine diphosphate).

What is required to resynthesise ATP from ADP and Pi?

• Energy
• Oxygen only
• Lactic acid
• Water
• Carbon dioxide

Answer explanation

Energy is needed to add a phosphate to ADP, forming ATP again.

What energy system provides the fastest rate of ATP resynthesis?

• ATP–CP system
• Aerobic system
• Anaerobic glycolysis
• Glycolytic–oxidative system
• Mitochondrial pathway

Answer explanation

The ATP–CP system is the quickest but provides energy for a short time.

What energy system provides the highest yield of ATP?

• Aerobic system
• ATP–CP system
• Anaerobic glycolysis
• Creatine system
• Glycolytic system

Answer explanation

The aerobic system has the highest ATP yield but works slowly.

Which fuel does the ATP–CP system primarily use?

• Creatine phosphate
• Carbohydrates
• Fats
• Proteins
• Oxygen

Answer explanation

The ATP–CP system uses creatine phosphate to quickly regenerate ATP.

What is the main benefit of the aerobic system?

• High ATP yield
• Fastest ATP production
• No oxygen needed
• Causes lactic acid build-up
• Only uses protein

Answer explanation

Although slow, the aerobic system produces the most ATP over time.