SCI Energy Systems & Exercise Physiology 2

Question 1

Excess Post-exercise Oxygen Consumption (EPOC) refers to:

Accepted Answer

Elevated oxygen uptake after exercise to restore homeostasis

Answer

Oxygen consumed during warm-up before class

Answer

Maximum oxygen used during the peak of exercise

Answer

Oxygen deficit at the very start of exercise

Question 2

The Krebs cycle (citric acid cycle), a key stage of aerobic metabolism, takes place in the:

Accepted Answer

Mitochondrial matrix

Answer

Cell nucleus

Answer

Cytoplasm

Answer

Sarcoplasmic reticulum

Question 3

Regular aerobic training improves the body's ability to use fat as fuel primarily by:

Accepted Answer

Increasing mitochondrial density and fat-oxidizing enzyme activity

Answer

Decreasing the number of mitochondria in muscle fibers

Answer

Shifting fuel use entirely to carbohydrates during all intensities

Answer

Reducing capillary density in working muscles

Question 4

During steady-state aerobic exercise, a rider's heart rate will typically:

Accepted Answer

Plateau and remain relatively constant

Answer

Continue to rise steadily throughout the session

Answer

Drop below resting levels within 10 minutes

Answer

Become irregular and unpredictable

Question 5

Which muscle fiber type is most resistant to fatigue and is preferentially recruited during low-intensity, prolonged cycling?

Accepted Answer

Type I (slow-twitch oxidative)

Answer

Type IIx (fast-twitch glycolytic)

Answer

Type IIa (fast-twitch oxidative-glycolytic)

Answer

Type III (intermediate-twitch)

Question 6

During high-intensity anaerobic cycling efforts, the primary fuel source is:

Accepted Answer

Muscle glycogen (glucose)

Answer

Free fatty acids

Answer

Amino acids from muscle protein

Answer

Phospholipids

Question 7

A respiratory exchange ratio (RER) of 1.0 indicates that the body is primarily burning:

Accepted Answer

Carbohydrates

Answer

Fat

Answer

Protein

Answer

A 50/50 mix of fat and carbohydrate