Final answer:
Slow-twitch muscle fibers (Type-I) have a high resistance to fatigue and are efficient at oxidative phosphorylation, suitable for aerobic, endurance activities.
Step-by-step explanation:
True, slow-twitch muscle fibers are indeed highly fatigue resistant and are very effective at oxidative phosphorylation. These fibers, otherwise known as Type-I fibers, are dense with capillaries and exceptionally rich in both mitochondria and myoglobin. Myoglobin is a critical protein that serves the purpose of storing oxygen, making these muscles highly efficient at sustaining aerobic activities, such as long-distance running or cycling. Slow-twitch fibers are also capable of contracting continuously over long periods, although they do not generate as much force as their fast-twitch counterparts.