CSCS CSCS: Bioenergetics of Exercise & Training 3

Question 1

The Cori cycle describes which metabolic relationship between skeletal muscle and the liver?

Accepted Answer

Reconversion of muscle-derived lactate to glucose in the liver

Answer

The Cori cycle shuttles lactate from exercising muscle to the liver, where it is converted back to glucose via gluconeogenesis.

Question 2

Which of the following correctly describes the relationship between exercise intensity and the respiratory exchange ratio (RER)?

Accepted Answer

RER rises above 1.0 during very high-intensity exercise due to CO2 buffering

Answer

At supramaximal intensities, excess CO2 is produced as bicarbonate buffers lactic acid, driving RER above 1.0.

Question 3

Which shuttle system transfers reducing equivalents (NADH) from the cytoplasm into the mitochondria to continue aerobic ATP production?

Accepted Answer

Malate-aspartate shuttle

Answer

The malate-aspartate shuttle (and glycerol-3-phosphate shuttle) transfers NADH electrons across the inner mitochondrial membrane for use in the electron transport chain.

Question 4

Glycogen depletion during prolonged exercise most directly impairs performance because:

Accepted Answer

CNS glucose supply is compromised and high-intensity work capacity declines

Answer

Glycogen depletion limits both brain glucose availability (causing fatigue) and the ability to sustain high-intensity exercise where carbohydrate is the primary fuel.

Question 5

Which statement about the Q10 effect is most relevant to exercise physiology?

Accepted Answer

Decreasing muscle temperature slows enzymatic reaction rates, reducing power output

Answer

The Q10 principle states that metabolic rate roughly doubles per 10°C increase; cold muscle has slower enzyme kinetics, reducing force and power production.

Certified Strength and Conditioning Specialist Practice Test

Certified Strength and Conditioning Specialist Practice Test

CSCS CSCS: Bioenergetics of Exercise & Training 3