Question

a mother sprints across the yard to grab her small child before he enters the street. the mother is using her a. type i a slow - twitch muscle fibers that provided her with a fast burst of movement b. type ii b fast - twitch muscle fibers that respond quickly and provide her with speed and strength c. type i b intermediate - twitch muscle fibers that respond quickly because they are delivered energy aerobically d. type ii a fast - twitch muscle fibers that act rapidly because they are delivered energy anaerobically please select the best answer from the choices provided.

Explanation:

Type II B fast - twitch muscle fibers are known for quick response, speed, and strength, which are needed for a short - burst, high - intensity activity like sprinting to grab a child. Type I slow - twitch fibers are for endurance, not fast bursts. There is no type I B intermediate - twitch fiber. Type II A fast - twitch fibers are a bit more oxidative than type II B but type II B is the best for pure speed and strength in short bursts.

Answer:

B. type II B fast - twitch muscle fibers that respond quickly and provide her with speed and strength