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Question 01

The enzymes of glycolysis are located in the:

a) mitochondrion

b) nucleus

c) cytoplasm

d) lysosomes

e) interstitial fluid

Question 02

Glycogen breakdown in exercising muscle is activated by:

a) insulin

b) cortisol

c) increased pH

d) amylase

e) none of the above

Question 03

If the mean rate of oxygen consumption of a male athlete during a training session is 2l/min, then his rate of energy expenditure is approximately:

a) 400 kJ/min

b) 200 kJ/min

c) 80 kJ/min

d) 40 kJ/min

e) 20 kJ/min

Question 04

After what period of time does maximal dynamic exercise become predominantly aerobic?

a) 10 seconds

b) 30 seconds

c) 1 minute

d) 4 minutes

e) 10 minutes

Question 05

Hydrogen ions are formed when:

a) glycogen becomes depleted

b) phosphocreatine breakdown occurs

c) pyruvate is converted to lactate

d) pyruvate is converted to acetyl CoA

e) glycolysis is being used as a major means of resynthesising ATP

Question 06

The net production of ATP via substrate-level phosphorylation in glycolysis is:

a) 2 from glucose and 3 from glycogen

b) 2 from glucose and 4 from glycogen

c) 3 from glucose and 4 from glycogen

d) 3 from glucose and 2 from glycogen

e) 3 from glucose and 3 from glycogen

Question 07

The average intensity of exercise (%VO₂max) for an elite middle distance runner during a 1500 m race will be about:

a) 80% VO₂max

b) 100% VO₂max

c) 120% VO₂max

d) 200% VO₂max

e) 300% VO₂max

Question 08

Muscle lactate production increases when:

a) oxygen is readily available

b) pyruvate cannot be formed from glucose breakdown

c) the pH of the muscle falls

d) glycolysis is activated at the onset of exercise

e) muscle glycogen becomes depleted

Question 09

Which of the following generates free glucose during the enzymatic breakdown of glycogen in skeletal muscle?

a) phosphorylase

b) debranching enzyme

c) α-1-6-amyloglucosidase

d) amylase

e) glucose-6-phosphatase

Question 10

Approximately how many kJ of energy are expended if an athlete's steady-rate oxygen uptake averages 3.0 l/min for 5 minutes of exercise?

a) 60 kJ

b) 150 kJ

c) 300 kJ

d) 500 kJ

e) 600 kJ

Question 11

The rate of blood lactate accumulation is determined by:

a) the rate of muscle lactate production and the rate of muscle lactate efflux

b) the rate of anaerobic glycolysis

c) the rate of muscle glucose uptake

d) the rate of muscle glycogen depletion

e) the difference between the rate of lactate appearance and the rate of lactate clearance

Question 12

The low intake of carbohydrate in the diet:

a) does not influence exercise performance in events lasting less than 10 minutes

b) affects the resting muscle pH

c) may impair high intensity exercise performance

d) results in greater reliance on muscle glycogen during exercise

e) is associated with a metabolic alkalosis

Question 13

Sodium bicarbonate ingestion improves middle distance running performance by:

a) elevating the pH and buffering capacity of the extracellular fluid allowing a faster efflux of hydrogen ions from muscle

b) reducing the pH and buffering capacity of the extracellular fluid allowing a faster efflux of hydrogen ions from muscle

c) elevating the pH and buffering capacity of the extracellular fluid allowing a faster influx of hydrogen ions into muscle

d) elevating the pre-exercise muscle pH

e) inhibiting muscle lactate production

Oxford University Press, Online Resource Centre, Chapter 04.

Chapter 04

Instructions