Chapter 43, Problem 15TYK

Summary Introduction

To review:

An experiment using rats to determine whether endurance training alters the proportion of slow, fast aerobic, and fast anaerobic muscle fibers.

Introduction:

Generally, muscle fibers are of three types: Slow muscle fibers contract slowly but do not fatigue rapidly. Fast aerobic fibers contract relatively quickly and vigorously, but fatigue quickly than slow fibers. Fast anaerobic fibers contract rapidly and vigorously than fast aerobic fibers but fatigue rapidly. The number of mitochondria in fiber determines its capacity to produce ATP.