Final answer:
Type I muscle fibers are predominantly aerobic, also known as slow-twitch fibers, and have a high capacity for endurance and fatigue-resistance. Type II muscle fibers, on the other hand, are more suited for rapid, anaerobic movements that require short bursts of energy.
Step-by-step explanation:
Type I muscle fibers are true primarily aerobic. They are also known as slow-twitch fibers and are rich in mitochondria and myoglobin. These fibers use oxidative metabolism to produce ATP, allowing them to sustain long-duration, aerobic activities such as long-distance running. They have a high capacity for endurance and fatigue-resistance. On the other hand, type II muscle fibers, also known as fast-twitch fibers, have a lower reliance on aerobic metabolism and are more suited for rapid, anaerobic movements that require short bursts of energy.