ACE Exercise Physiology

Question 1

Which energy system is the PRIMARY source of ATP during a 100-meter sprint?

Accepted Answer

Phosphocreatine (ATP-PC) system

Answer

Oxidative phosphorylation

Answer

Glycolytic system

Answer

Beta-oxidation

Question 2

What is the term for the maximum amount of oxygen the body can consume per minute during maximal exercise?

Accepted Answer

VO2 max

Answer

Lactate threshold

Answer

Oxygen pulse

Answer

Respiratory exchange ratio

Question 3

During prolonged, low-intensity exercise, which fuel source becomes increasingly predominant?

Accepted Answer

Fat (free fatty acids)

Answer

Muscle glycogen

Answer

Blood glucose

Answer

Protein

Question 4

Which of the following best describes the 'lactate threshold'?

Accepted Answer

The exercise intensity at which lactate begins to accumulate faster than it can be cleared

Answer

The point at which lactic acid production completely stops

Answer

The maximum heart rate achievable during exercise

Answer

The intensity at which carbohydrate use stops

Question 5

The Frank-Starling mechanism states that cardiac output increases because:

Accepted Answer

Greater ventricular filling (preload) leads to a more forceful contraction

Answer

Heart rate rises proportionally with exercise intensity

Answer

Blood pressure decreases during exercise

Answer

Stroke volume is fixed regardless of filling volume

Question 6

Which hormone is primarily responsible for the breakdown of glycogen into glucose during high-intensity exercise?

Accepted Answer

Epinephrine (adrenaline)

Answer

Insulin

Answer

Glucagon

Answer

Cortisol

Question 7

What is 'excess post-exercise oxygen consumption' (EPOC) primarily attributed to?

Accepted Answer

Elevated oxygen demand to restore homeostasis after exercise

Answer

Increased fat storage after exercise

Answer

Decreased metabolic rate during recovery

Answer

Immediate glycogen synthesis