Question

lo 4.3. what are the two main types of muscle fibers?
red and white fibers
smooth and striated fibers
type a and type b fibers
slow - twitch (type i) and fast - twitch (type ii) fibers.
thin and thick fibers

Explanation:

Muscle fibers are mainly classified as slow - twitch (Type I) which are endurance - oriented and fast - twitch (Type II) which are power - oriented.

Answer:

D. slow twitch (Type I) and fast - twitch (Type II) fibers