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Skeletal Muscle Fiber Types

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Questions and Answers

Which type of muscle fibers are fatigue-resistant and suitable for endurance activities?

Fast-twitch (Type II) fibers

Endurance-twitch fibers

Medium-twitch fibers

Slow-twitch (Type I) fibers (correct)

What type of activities are fast-twitch fibers ideal for?

Long-distance running

Sprinting (correct)

Swimming slowly

Cycling at a steady pace

What is the role of a motor unit in muscle contraction?

Causing muscle fatigue

Generating muscle force (correct)

Producing energy for muscles

Regulating body temperature

According to the size principle, which motor units are recruited first?

Smaller motor units Signup and view all the answers

How do motor neurons signal the amount of force required from muscles?

By adjusting firing rates Signup and view all the answers

What is the primary mechanism by which muscle force output increases as strength demands rise?

Recruiting progressively larger motor units Signup and view all the answers

How does spatial recruitment affect force production in skeletal muscles?

It activates more motor units to increase force production Signup and view all the answers

What role do antagonist muscles play in movement?

They provide balance and stability around joints Signup and view all the answers

How do muscles adapt their contraction speed and force output based on external forces?

By adjusting based on the encountered load during movement Signup and view all the answers

What is the primary function of bones in the musculo-skeletal system lever system?

Transmit forces generated by muscles to produce motion Signup and view all the answers