Question

lo 4.2. what are the two main types of muscle fibers? red and white fibers slow - twitch (type i) and fast - twitch (type ii) fibers. involuntary and voluntary fibers. cardiac and skeletal fibers type a and type b fibers.

Explanation:

Muscle fibers are mainly classified as slow - twitch (Type I) which are fatigue - resistant and used for endurance activities, and fast - twitch (Type II) which generate more power but fatigue quickly.

Answer:

B. Slow - twitch (Type I) and fast - twitch (Type II) fibers.