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Questions and Answers
White muscle fibers, abundant in sprinters, are characterized by a small cell diameter, leading to increased power output.
White muscle fibers, abundant in sprinters, are characterized by a small cell diameter, leading to increased power output.
False (B)
Red muscle fibers, prevalent in endurance athletes, owe their sustained aerobic metabolism to abundant myoglobin, an oxygen-carrying pigment.
Red muscle fibers, prevalent in endurance athletes, owe their sustained aerobic metabolism to abundant myoglobin, an oxygen-carrying pigment.
True (A)
Elite powerlifters primarily rely on red muscle fibers due to their exceptional endurance capabilities.
Elite powerlifters primarily rely on red muscle fibers due to their exceptional endurance capabilities.
False (B)
White muscle fibers exhibit a red color due to high myoglobin levels, facilitating efficient oxygen delivery.
White muscle fibers exhibit a red color due to high myoglobin levels, facilitating efficient oxygen delivery.
Sprinting performance is supported by muscles rich in white fibers, which feature limited blood supply and fewer mitochondria compared to red fibers.
Sprinting performance is supported by muscles rich in white fibers, which feature limited blood supply and fewer mitochondria compared to red fibers.
Red muscle fibers are characterized by lower vascularity, which enhances their capacity for long term aerobic metabolism.
Red muscle fibers are characterized by lower vascularity, which enhances their capacity for long term aerobic metabolism.
White muscle fibers have a slower speed of contraction and are therefore suitable for endurance activities.
White muscle fibers have a slower speed of contraction and are therefore suitable for endurance activities.
Elite marathon runners typically exhibit muscles with a higher proportion of red muscle fibers to support sustained aerobic metabolism.
Elite marathon runners typically exhibit muscles with a higher proportion of red muscle fibers to support sustained aerobic metabolism.
Due to the abundance of blood vessels in white muscle tissue, they are ideal for extended physical activity.
Due to the abundance of blood vessels in white muscle tissue, they are ideal for extended physical activity.
Red muscle fibers contain less actin and myosin than white muscle fibers, which gives them better endurance.
Red muscle fibers contain less actin and myosin than white muscle fibers, which gives them better endurance.
Flashcards
White Fibers
White Fibers
Muscle fibers optimized for power and speed, but fatigue quickly due to limited oxygen and fewer mitochondria.
White Fiber Characteristics
White Fiber Characteristics
Large cell diameter and abundant actin/myosin enable powerful and rapid contractions.
Red Fibers
Red Fibers
Muscle fibers designed for endurance, with high myoglobin content, abundant mitochondria, and rich blood supply.
Myoglobin Function
Myoglobin Function
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Red Fiber Advantages
Red Fiber Advantages
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Study Notes
- There are two types of muscle fibers: white and red fibers.
White Fibers ("fast"/"fatiguing" cells)
- White fibers are most abundant in chicken breast meat and the well-developed muscles of sprinters or powerlifters.
- These muscles are powerful and fast, but lack significant endurance.
- White fibers have a large cell diameter with abundant actin and myosin, resulting in power.
- They have a rapid speed of contraction.
- Oxygen is less available to white fibers, reducing endurance.
- White fibers have a white color due to low myoglobin levels.
- They have a limited blood supply.
- White fibers have fewer mitochondria compared to red fibers.
- Fatigue sets in faster in white fibers.
Red Fibers ("slow"/"oxidizing" cells)
- Red fibers are most abundant in chicken leg meat and the muscles of marathon runners or other endurance athletes.
- These cells have a small cell diameter resulting in less power.
- Red fibers can sustain work over long periods of time due to high endurance
- Red fibers are red in color because myoglobin is abundant allowing cells to sustain aerobic metabolism for longer periods.
- Red fibers are very vascular, increasing oxygen supply.
- They have abundant mitochondria.
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