NCCPT Nutrition and Energy Systems 2

Question 1

Which energy system predominates during a 400-meter sprint?

Accepted Answer

Glycolytic system

Answer

The glycolytic system (anaerobic glycolysis) dominates during high-intensity efforts lasting 30 seconds to 2 minutes, such as a 400-meter sprint.

Question 2

What is the primary role of insulin in nutrient metabolism?

Accepted Answer

Facilitating cellular glucose uptake

Answer

Insulin facilitates the uptake of glucose into cells by promoting GLUT4 transporter activity, lowering blood glucose levels.

Question 3

During prolonged endurance exercise, what substrate shift occurs after glycogen depletion?

Accepted Answer

Increased fat oxidation via beta-oxidation

Answer

As glycogen stores deplete during prolonged exercise, the body increasingly relies on fat oxidation (beta-oxidation) to supply acetyl-CoA for the Krebs cycle.

Question 4

Which vitamin is essential for the conversion of pyruvate to acetyl-CoA?

Accepted Answer

Vitamin B1 (thiamine)

Answer

Thiamine (vitamin B1) is a coenzyme required for pyruvate dehydrogenase, the enzyme that converts pyruvate to acetyl-CoA.

Question 5

What is the glycemic index (GI) of a food?

Accepted Answer

A ranking of how quickly a food raises blood glucose relative to pure glucose

Answer

The glycemic index ranks foods on a scale of 0–100 based on how rapidly they raise blood glucose compared to pure glucose (GI=100).

(NCCPT) National Council for Certified Personal Trainers Practice Test

(NCCPT) National Council for Certified Personal Trainers Practice Test

NCCPT Nutrition and Energy Systems 2