Multiple Choice
In which part of the cell does glycolysis occur?
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8. Respiration
Glycolysis
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Which of the following is a characteristic of glycolytic fibers?
A
High mitochondrial density
B
High endurance and slow contraction speed
C
Primarily use oxidative phosphorylation for energy
D
Low endurance and fast contraction speed
Verified step by step guidance1
Understand the types of muscle fibers: Muscle fibers can be broadly categorized into glycolytic fibers and oxidative fibers. Glycolytic fibers are also known as fast-twitch fibers, while oxidative fibers are slow-twitch fibers.
Identify the energy source: Glycolytic fibers primarily rely on glycolysis for energy production, which is a quick process that does not require oxygen, unlike oxidative phosphorylation.
Consider contraction speed: Glycolytic fibers are designed for rapid and powerful contractions, which is why they are often referred to as fast-twitch fibers.
Evaluate endurance: Due to their reliance on glycolysis, glycolytic fibers have low endurance. They fatigue quickly because glycolysis is less efficient in terms of ATP production compared to oxidative phosphorylation.
Summarize characteristics: Based on the above points, glycolytic fibers are characterized by low endurance and fast contraction speed, making them suitable for short bursts of activity rather than prolonged endurance tasks.
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