muscle fibre types Flashcards
What are the three main types of muscle fibers?
Type I, Type IIa, and Type IIb.
True or False: Type I muscle fibers are also known as slow-twitch fibers.
True.
Fill in the blank: Type IIa fibers are classified as __________ fibers.
fast-twitch oxidative.
What is the primary energy source for Type I muscle fibers?
Aerobic metabolism.
Which muscle fiber type is most resistant to fatigue?
Type I.
True or False: Type IIb fibers have a higher oxidative capacity than Type IIa fibers.
False.
What color are Type I muscle fibers typically described as?
Red.
Which muscle fiber type is best suited for short bursts of power?
Type IIb.
What is a key characteristic of Type IIa muscle fibers?
They have both aerobic and anaerobic capabilities.
Multiple Choice: Which type of muscle fiber has the largest diameter? A) Type I B) Type IIa C) Type IIb
C) Type IIb.
True or False: Type IIa fibers can adapt to endurance training.
True.
What is the main function of Type IIb muscle fibers?
Rapid and powerful contractions.
Fill in the blank: Muscle fibers are composed of __________.
myofibrils.
Which muscle fiber type is primarily used in endurance activities?
Type I.
What is the main characteristic of Type IIb fibers?
They fatigue quickly.
Multiple Choice: Which muscle fiber type has the highest myoglobin content? A) Type I B) Type IIa C) Type IIb
A) Type I.
True or False: All muscle fibers can be trained to improve their performance.
True.
What type of muscle fiber would be predominant in a sprinter?
Type IIb.
Fill in the blank: The contraction speed of Type I fibers is __________.
slow.
Which muscle fiber type has the highest force production?
Type IIb.
True or False: Type I fibers are more vascularized than Type IIb fibers.
True.
What type of training primarily benefits Type IIa fibers?
Mixed aerobic and anaerobic training.
Multiple Choice: Which muscle fiber type is known for its high resistance to fatigue? A) Type I B) Type IIa C) Type IIb
A) Type I.
True or False: Type IIa fibers are exclusively anaerobic.
False.
What is the primary role of satellite cells in muscle fibers?
Muscle repair and growth.
Fill in the blank: Muscle fibers are surrounded by a connective tissue layer called __________.
endomysium.
What adaptation occurs in Type I fibers with endurance training?
Increased oxidative capacity.
