SCI Energy Systems & Exercise Physiology

Question 1

Which of the following correctly identifies the three primary energy systems used during exercise?

Accepted Answer

Phosphagen, Glycolytic, and Oxidative

Answer

Anaerobic, Lactic, and Mitochondrial

Answer

Aerobic, Alactic, and Phosphate

Answer

Creatine, Glucose, and Oxygen systems

Question 2

Which energy system provides ATP most rapidly but is limited to only 8–10 seconds of maximal effort?

Accepted Answer

Phosphagen (ATP-PCr) system

Answer

Oxidative system

Answer

Glycolytic system

Answer

Gluconeogenesis pathway

Question 3

At low-to-moderate exercise intensities, the aerobic energy system primarily relies on which substrate?

Accepted Answer

Fat (free fatty acids)

Answer

Protein

Answer

Phosphocreatine

Answer

Lactate only

Question 4

VO2 max is best defined as the:

Accepted Answer

Maximum rate of oxygen consumption during intense exercise

Answer

Maximum heart rate achievable during intense exercise

Answer

Volume of air exhaled per minute at peak effort

Answer

Maximum blood lactate level tolerated during exercise

Question 5

The lactate threshold is best described as the exercise intensity at which:

Accepted Answer

Blood lactate concentration rises faster than it can be cleared

Answer

Muscles begin to use oxygen for the first time

Answer

The heart reaches its maximum rate

Answer

Fat oxidation stops completely

Question 6

During a 10-second all-out sprint on an indoor cycling bike, which energy system contributes the most ATP?

Accepted Answer

Phosphagen (ATP-PCr) system

Answer

Oxidative phosphorylation

Answer

Glycolysis

Answer

Beta-oxidation

Question 7

Cardiac output during exercise is calculated as:

Accepted Answer

Heart rate × stroke volume

Answer

Heart rate × blood pressure

Answer

Stroke volume ÷ heart rate

Answer

VO2 max × body weight