CSCS: Bioenergetics of Exercise & Training Flashcards
7 cards from real CSCS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 CSCS: Bioenergetics of Exercise & Training flashcards as text
The Cori cycle describes which metabolic relationship between skeletal muscle and the liver?
Answer: Reconversion of muscle-derived lactate to glucose in the liver
The Cori cycle shuttles lactate from exercising muscle to the liver, where it is converted back to glucose via gluconeogenesis.
Which of the following correctly describes the relationship between exercise intensity and the respiratory exchange ratio (RER)?
Answer: RER rises above 1.0 during very high-intensity exercise due to CO2 buffering
At supramaximal intensities, excess CO2 is produced as bicarbonate buffers lactic acid, driving RER above 1.0.
Which shuttle system transfers reducing equivalents (NADH) from the cytoplasm into the mitochondria to continue aerobic ATP production?
Answer: Malate-aspartate shuttle
The malate-aspartate shuttle (and glycerol-3-phosphate shuttle) transfers NADH electrons across the inner mitochondrial membrane for use in the electron transport chain.
Glycogen depletion during prolonged exercise most directly impairs performance because:
Answer: CNS glucose supply is compromised and high-intensity work capacity declines
Glycogen depletion limits both brain glucose availability (causing fatigue) and the ability to sustain high-intensity exercise where carbohydrate is the primary fuel.
Which statement about the Q10 effect is most relevant to exercise physiology?
Answer: Decreasing muscle temperature slows enzymatic reaction rates, reducing power output
The Q10 principle states that metabolic rate roughly doubles per 10°C increase; cold muscle has slower enzyme kinetics, reducing force and power production.
Which of the following best characterizes the 'crossover concept' in substrate utilization?
Answer: The exercise intensity at which carbohydrate oxidation begins to exceed fat oxidation
The crossover concept describes the exercise intensity at which energy from carbohydrate oxidation exceeds that from fat, influenced by training status and diet.
During steady-state aerobic exercise at moderate intensity, the primary fate of pyruvate is:
Answer: Transport into the mitochondria and conversion to acetyl-CoA
At moderate intensities, adequate oxygen allows pyruvate to enter the mitochondria and be oxidized to acetyl-CoA by pyruvate dehydrogenase.