Final answer:
Slow fibers, also known as type I fibers or slow-twitch muscle fibers, are specialized for endurance and aerobic activities such as long-distance running, are rich in myoglobin and mitochondria, and have a dense capillary network.
Step-by-step explanation:
Slow fibers, also known as type I fibers or slow-twitch muscle fibers, are a type of skeletal muscle cell that excels in endurance and is mainly responsible for aerobic activities such as long-distance running. These fibers are characterized by their red color due to the presence of the pigment myoglobin, which binds oxygen and facilitates its use during aerobic metabolism. They are rich in mitochondria, which are essential for the sustained production of ATP through aerobic respiration. This high mitochondrial content, combined with a dense network of capillaries surrounding the fibers, allows for efficient delivery of oxygen to the muscles, enabling them to contract for extended periods without fatiguing quickly.