Select the characteristics of slow-twitch muscle fibers. Check all that apply. Few capillaries are present. These fibers are also known as white fibers. Myoglobin is present in high concentration. Mitochondria are numerous in these fibers.
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Step 1: Slow-twitch muscle fibers are also known as Type I muscle fibers. Show more…
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Which is a characteristic of fast-twitch muscle fibers? A. They contain more myoglobin than slow-twitch fibers. B. They are resistant to fatigue. C. They have fewer mitochondria than slow-twitch fibers. D. They require high amounts of oxygen in order to function.
Place the following descriptions with the appropriate skeletal muscle fiber type. Labels can be used more than once. Slow twitch fibers Oxidative Contracts slowly Primarily oxidative Red fibers Combination of oxidative and glycolytic Fast twitch fibers Lots of mitochondria Fatigable Intermediate fibers White fibers Fatigue resistant Type I fibers Type IIa fibers Type IIb fibers
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In a muscle fiber, a. the sarcolemma is connective tissue holding the myofibrils together. b. the sarcoplasmic reticulum stores calcium. c. both myosin and actin filaments have cross-bridges. d. there is a T system but no endoplasmic reticulum. e. All of these are correct.
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