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 single muscle fiber and its sarcomere

Answer

The NMJ between nerve and bone

Answer

A group of muscles activated by the brain

Question 2

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

Accepted Answer

Stored fat (triglycerides)

Answer

Creatine phosphate

Answer

Blood glucose

Answer

Muscle glycogen

Question 3

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

Accepted Answer

Abduction

Answer

Adduction

Answer

Flexion

Answer

Extension

Question 4

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

Accepted Answer

Neuromuscular junction (NMJ)

Answer

Tendon

Answer

Myofibril

Answer

Sarcolemma

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

Muscles either reach full hypertrophy or none at all

Answer

The entire muscle contracts or none of it does

Answer

Muscle fibers only fire when all ATP is consumed

Question 6

Which muscle action occurs when the muscle produces force while lengthening?

Accepted Answer

Eccentric

Answer

Concentric

Answer

Isometric

Answer

Isokinetic