NCSF-CPT Exercise Science & Anatomy 3

Question 1

Which of the following best defines 'motor unit'?

Accepted Answer

A motor neuron and all the muscle fibers it innervates

Answer

A motor unit consists of a single motor neuron and all of the skeletal muscle fibers it innervates and controls.

Question 2

What is the primary fuel source during low-intensity, long-duration aerobic exercise?

Accepted Answer

Stored fat (triglycerides)

Answer

At low intensities, the aerobic system predominantly oxidizes stored fat (triglycerides) for sustained energy production.

Question 3

What anatomical term describes movement away from the body's midline?

Accepted Answer

Abduction

Answer

Abduction describes movement of a limb away from the body's midline, such as raising the arm out to the side.

Question 4

Which structure transmits nerve impulses from motor neuron to muscle fiber?

Accepted Answer

Neuromuscular junction (NMJ)

Answer

The neuromuscular junction (NMJ) is the synapse where a motor neuron releases acetylcholine to stimulate muscle fiber contraction.

Question 5

What occurs during the 'all-or-none' principle of muscle fiber contraction?

Accepted Answer

A muscle fiber contracts maximally or not at all

Answer

The all-or-none principle states that when a muscle fiber is stimulated above threshold, it contracts with full force; below threshold, it does not contract at all.

NCSF-CPT Exam Practice Test

NCSF-CPT Exam Practice Test

NCSF-CPT Exercise Science & Anatomy 3