NASM-CPT Exercise Science Fundamentals

Question 1

Which energy system provides the majority of ATP during high-intensity exercise lasting 10–30 seconds?

Accepted Answer

Glycolytic system

Answer

The glycolytic system predominates for high-intensity efforts lasting roughly 10–30 seconds by breaking down glucose for rapid ATP production.

Question 2

The sliding filament theory describes muscle contraction as a process in which:

Accepted Answer

Actin and myosin filaments slide past each other

Answer

In the sliding filament theory, actin filaments are pulled toward the center of the sarcomere by myosin cross-bridge cycling, shortening the muscle.

Question 3

Which type of muscle fiber has the highest oxidative capacity and is most resistant to fatigue?

Accepted Answer

Type I

Answer

Type I (slow-twitch) fibers have abundant mitochondria and high oxidative capacity, making them highly fatigue-resistant.

Question 4

What is the primary role of the Golgi tendon organ (GTO)?

Accepted Answer

Detect changes in muscle tension and inhibit overcontracting muscles

Answer

The GTO monitors tension within the tendon and triggers autogenic inhibition to protect the muscle from excessive force.

Question 5

Stroke volume is best defined as:

Accepted Answer

The volume of blood ejected per heartbeat

Answer

Stroke volume is the amount of blood pumped out of the left ventricle with each heartbeat, measured in milliliters.

NASM Practice Test