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A student was provided with two muscle samples labeled as 1 and 2. Upon comparison, the student observed that muscle 1 contained a significant amount of myoglobin and utilized stored oxygen for ATP production, while muscle 2 had lower levels of myoglobin, mitochondria, and a high sarcoplasmic reticulum. Select the correct statement regarding muscles 1 and 2 from the following options:
Both muscles are classified as aerobic muscles.
Both muscles are classified as red fibers and rely on aerobic processes for energy.
Muscle 1 is categorized as white fibers, whereas muscle 2 relies on aerobic processes for energy.
Muscle 1 is classified as red fibers and aerobic muscles, whereas muscle 2 is categorized as white fibers and relies on anaerobic processes for energy.
Answers (1)
Muscles 1 and 2 exhibit distinct characteristics, with muscle 1 being classified as red muscle fiber and muscle 2 as white muscle fiber. Red muscle fiber, also known as Type I or slow twitch muscle fiber, is characterized by its dense capillary network, high mitochondria content, and abundant myoglobin, resulting in its red color. This type of muscle fiber is well-suited for sustained aerobic activities, utilizing fats or carbohydrates as fuel. It contracts for extended periods but with lower force. On the other hand, white muscle fiber, or Type II or fast twitch muscle fiber, contracts rapidly and forcefully but tires quickly. It primarily relies on anaerobic metabolism for short bursts of activity and is least dense in mitochondria and myoglobin. Hence, the correct answer is option 4.
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