Exercise Physiology Flashcards
7 cards from real ACE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Exercise Physiology flashcards as text
Which energy system is the PRIMARY source of ATP during a 100-meter sprint?
Answer: Phosphocreatine (ATP-PC) system
The ATP-PC (phosphocreatine) system provides immediate, high-power energy for very short, maximal-intensity efforts lasting up to about 10 seconds.
What is the term for the maximum amount of oxygen the body can consume per minute during maximal exercise?
Answer: VO2 max
VO2 max (maximal oxygen uptake) represents the ceiling of the cardiorespiratory system's ability to deliver and use oxygen during intense exercise.
During prolonged, low-intensity exercise, which fuel source becomes increasingly predominant?
Answer: Fat (free fatty acids)
At low intensities, the oxidative system has time to metabolize fat (free fatty acids), making fat the dominant fuel source during prolonged, easy-paced activity.
Which of the following best describes the 'lactate threshold'?
Answer: The exercise intensity at which lactate begins to accumulate faster than it can be cleared
Lactate threshold is the intensity where lactate production exceeds clearance, causing blood lactate to rise rapidly, typically signaling a shift to heavier anaerobic metabolism.
The Frank-Starling mechanism states that cardiac output increases because:
Answer: Greater ventricular filling (preload) leads to a more forceful contraction
The Frank-Starling mechanism describes how increased end-diastolic volume stretches the ventricles, causing a stronger contraction and greater stroke volume.
Which hormone is primarily responsible for the breakdown of glycogen into glucose during high-intensity exercise?
Answer: Epinephrine (adrenaline)
Epinephrine is rapidly released by the adrenal medulla during intense exercise and strongly stimulates glycogenolysis (glycogen breakdown) in liver and muscle.
What is 'excess post-exercise oxygen consumption' (EPOC) primarily attributed to?
Answer: Elevated oxygen demand to restore homeostasis after exercise
EPOC reflects the elevated oxygen consumption above resting levels that occurs after exercise to restore metabolic processes such as re-synthesizing ATP, clearing lactate, and returning body temperature to normal.