AIIMS 2018 Zoology Types of Muscle Fibers MCQ Question

Option C is correct because red muscle fibers, also known as slow-twitch fibers, have a lower amount of sarcoplasmic reticulum compared to white muscle fibers, which are designed for rapid contractions. This lower content is due to their primary function in endurance activities, relying on aerobic metabolism rather than quick bursts of energy. In contrast, options A and B are incorrect as red muscle fibers are characterized by a high density of mitochondria and myoglobin, which facilitate aerobic respiration and oxygen storage, respectively. Option D is also accurate since these fibers are indeed referred to as aerobic muscles due to their reliance on oxygen for sustained energy production.