Muscle Fiber Types Quiz

What is the primary structural unit within a muscle that is made up of bundles of fibers?

• Tendon

• Fascicle

• Myofibril

• Myoglobin

Which type of muscle fiber is known for being a slow-twitch fiber?

• Type 1

• Type 2a

• Type 2x

• Type 3

Type 1 muscle fibers are best suited for which type of activities?

• Short sprints

• Powerlifting

• Marathons

• High jump

What is the main energy source for Type 1 muscle fibers?

• Oxidative sources

• ATP-PC system

• Glycolytic sources

• Lactate system

Type 2a fibers are characterized by which of the following?

• Slow contraction speed

• High force production

• White color

• Low fatigue resistance

Which energy systems do Type 2a fibers primarily utilize?

• Only glycolytic

• Only oxidative

• ATP-PC and lactate

• Oxidative and glycolytic

Type 2x fibers are most suitable for which type of sports?

• Long-distance running

• Powerlifting

• Moderate-duration swimming

• Cycling

What is a key characteristic of Type 2x muscle fibers?

• High endurance

• Slow recovery

• High force production

• Red color

According to Henneman's size principle, which fibers are recruited first during muscle contraction?

• Type 2a fibers

• Type 2x fibers

• Type 1 fibers

• All fibers simultaneously

What happens when the intensity of a task increases beyond the capacity of Type 1 fibers?

• The task cannot be completed

• Type 2a fibers are recruited

• Type 2x fibers are recruited

• Type 1 fibers increase force production