Muscle Fiber Types Quiz

Which muscle fiber type is commonly referred to as "fast-twitch oxidative-glycolytic"?

• A) Type I

• B) Type IIa

• C) Type IIb

• D) Type III

Which muscle fiber type is characterized by a high glycolytic capacity and fast contraction speed?

• A) Type I

• B) Type IIa

• C) Type IIb

• D) Type III

During prolonged submaximal exercise, which muscle fiber type is primarily recruited?

• A) Type I

• B) Type IIa

• C) Type IIb

• D) Type III

What is the main factor determining the speed of muscle contraction?

• A) Muscle fiber type

• B) Motor unit size

• C) Myoglobin content

• D) Creatine phosphate availability

What is the primary function of Type I muscle fibers?

• A) Explosive power

• B) Rapid force generation

• C) Sustained contraction over long durations

• D) Anaerobic metabolism

Which muscle fiber type has the highest oxidative capacity?

• A) Type I

• B) Type IIa

• C) Type IIb

• D) Type III

Which of the following best describes a motor unit?

• A) A single muscle fiber and the neurons that innervate it

• B) A group of muscle fibers controlled by a single motor neuron

• C) The point where a motor neuron and a muscle fiber meet

• D) A bundle of muscle fibers surrounded by perimysium

What is the main energy system used by Type IIb muscle fibers during intense, short-duration activities?

• A) Aerobic system

• B) Phosphagen system

• C) Glycolytic system

• D) Krebs cycle

Which of the following statements about motor units is true?

• A) All motor units within a muscle contract simultaneously.

• B) Type I motor units are larger and generate more force than Type II motor units.

• C) Type II motor units are recruited first during low-intensity activities.

• D) Motor units can vary in size and recruitment threshold.

Which muscle fiber type is primarily associated with endurance activities?

• A) Type I

• B) Type IIa

• C) Type IIb

• D) Type III