Question

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

Explanation:

Muscle fibers are mainly classified into slow - twitch (Type I) which are endurance - oriented and fast - twitch (Type II) which are more for short - burst, high - intensity activities.

Answer:

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