Types of Muscle Fibers

Interactive Lecture

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​Muscle Fiber Types

Open Ended

What are the two criteria used to classify skeletal muscle fiber types?

Open Ended

Describe the difference between slow fibers and fast fibers.

Open Ended

Explain the metabolic pathways used by oxidative fibers and glycolytic fibers to produce ATP.

Multiple Choice

Which of the following muscle fiber types is primarily involved in endurance activities and relies on aerobic metabolism?

• Fast oxidative (FO) fibers

• Slow oxidative (SO) fibers

• Fast glycolytic (FG) fibers

• None of the above

Fill in the Blanks

The muscle fiber type that relies on anaerobic glycolysis and is best suited for short, intense activities is called

.

Fill in the Blanks

The muscle fiber type that relies on anaerobic glycolysis and is best suited for short, intense activities is called

.

Open Ended

Explain the functional differences between slow oxidative (SO) fibers, fast oxidative (FO) fibers, and fast glycolytic (FG) fibers.

Multiple Choice

Which muscle fiber type is characterized by small diameter, slow speed of contraction, and high myoglobin content?

• Fast oxidative (FO) fibers

• Fast glycolytic (FG) fibers

• Slow oxidative (SO) fibers

• Intermediate glycolytic (IG) fibers

Multiple Choice

Which of the following factors does NOT affect the force of muscle contraction?

• Frequency of stimulation

• Number of muscle fibers stimulated

• Color of muscle fibers

• Degree of muscle stretch

Fill in the Blanks

The force of muscle contraction is dependent on the number of

attached.

Open Ended

Explain how the degree of muscle stretch affects the force of muscle contraction.

Multiple Choice

At what percentage of its resting length does a sarcomere produce maximal tension?

• 40-60%

• 60-80%

• 80-120%

• 120-140%

Open Ended

Explain the length-tension relationship in a sarcomere and how it affects muscle contraction.

Multiple Choice

What term describes the increase in muscle size due to use?

• Atrophy

• Hypertrophy

• Hyperplasia

• Myopathy

Open Ended

Describe the process and effects of hypertrophy and atrophy on skeletal muscle fibers.

Multiple Choice

Which type of muscle fibers are primarily utilized during aerobic (endurance) exercises?

• Fast glycolytic fibers

• Slow glycolytic fibers

• Oxidative fibers

• Mixed fibers

Fill in the Blanks

Aerobic (endurance) exercise leads to an increase in the number of

, myoglobin synthesis, and muscle capillaries.

Fill in the Blanks

Resistance exercise leads to muscle hypertrophy by increasing the formation of

.

Poll

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