Exam 5: Macronutrient Metabolism

During light exercise, __________ remains the main energy substrate.

Intramuscular high-energy phosphates supply the majority of energy for intense exercise.

Carbohydrate is the predominant fuel during intense aerobic exercise.

Protein has the same RDA for children as for adults.

If energy intake fails to match energy expenditure during intense training, even twice the protein RDA may not maintain nitrogen balance.

__________ sources supply most of the energy for fast movements or during increased resistance to movement at a given speed.

The primary fuel during light and moderate exercise is __________.

Lactate accumulation leads to fatigue because this compound:

Which of the following statements is true concerning macronutrient catabolism during physical activity?

As muscle glycogen stores diminish, __________ becomes the major supplier of carbohydrate energy.

Severely lowered levels of liver and muscle glycogen during physical activity induce all of the following except __________.

This hormone does not activate lipase.

Branched-chain amino acids that are oxidized in skeletal muscle rather than in liver include all of the following except __________.

For macronutrient catabolism, carbohydrate (reactions of glycolysis) becomes the sole ATP contributor in anaerobic exercise.

Which of the following stimulates FFA liberation for energy in prolonged exercise?

A trained muscle's augmented mitochondrial oxidative capacity and increased glycogen storage helps to explain the muscle's enhanced capacity for carbohydrate breakdown in exercise.

Compared with untrained muscle, trained muscle tends __________ glycogen reserves.

Protein's primary role is to provide amino acid building blocks for tissue synthesis.

One hour of intense exercise would significantly decrease __________ glycogen content.

A protein-deficient diet rapidly depletes muscle and liver glycogen.