Bioenergetics and Energy Systems Quiz

The process of converting macronutrients (carbohydrates, fats, and proteins) into energy that the cells can use.

The ability to do work. It can be stored (potential energy) or used to perform an action (kinetic energy).

The primary energy source for all cellular processes. It stores and releases energy through the breakdown of its phosphate bonds.

Three energy systems that our bodies use to produce ATP for muscle contractions: Phosphagen (immediate), Glycolytic (short-term), and Oxidative (long-term).

The energy system that provides the fastest ATP production. It uses stored creatine phosphate to quickly re-phosphorylate ADP into ATP. It works for short bursts of high-intensity activity.

The energy system that uses glucose (sugar) to produce ATP without oxygen. It is less efficient than the oxidative system but can produce ATP quickly for moderate-intensity activities.

The most efficient energy system that uses oxygen to generate ATP from carbohydrates, fats, and proteins. It is the primary energy system for endurance activities.

The intensity of exercise dictates which energy system is primarily used. Higher intensity activities rely more on the phosphagen and glycolytic systems, while lower intensity activities use the oxidative system.

The intensity of exercise determines which energy system is used, NOT the duration. This means that you can be using multiple energy systems simultaneously depending on the intensity of the exercise.

The energy systems don't simply switch off and on like a light switch. They function based on the intensity of the exercise. You can be using multiple systems at the same time depending on the intensity of the exercise.

While the phosphagen system is the primary source for high-intensity activities lasting up to 10-15 seconds, it does not completely run out after 6 seconds. Other energy systems are contributing to ATP production throughout.

The percentage of ATP produced from each energy system changes depending on the intensity of the exercise. The more intense the exercise, the more the phosphagen system contributes.

The efficiency of an energy system refers to the amount of ATP produced per substrate used. In other words, how much energy we get out from the fuel we put in. Different energy systems have different efficiencies.