Skeletal muscles, which move bones, consist of cells fused into long fibers. These muscle fibers differ in how they make ATP. Red muscle fibers use aerobic respiration to generate ATP. Red muscle fibers have greater endurance because they can continue to generate ATP as long as they continue to get oxygen. White muscle fibers use anaerobic respiration to generate ATP. White muscle fibers can generate ATP very quickly for short bursts of energy but they cannot sustain this for long periods of time. Red muscle fibers are darker in color than white muscle fibers. This difference in color is partially because red muscle fibers have many more mitochondria than white muscle fibers, and the mitochondria require a large number of myoglobin proteins. Myoglobin proteins help transport oxygen to the mitochondria and create the deep red color of red muscle fibers. Which of the following statements correctly describes why white muscle fibers do not need as many mitochondria as red muscle fibers? A. White muscle fibers use anaerobic respiration, which requires more efficient mitochondria than aerobic respiration. B. White muscle fibers use anaerobic respiration, which does not occur in the mitochondria. C. Mitochondria in the white muscle fibers are more efficient.

Lifetime Physical Fitness & Wellness

15th Edition

ISBN:9781337677509

Author:HOEGER

Publisher:HOEGER

Chapter8: Muscular Flexibility

Section: Chapter Questions

Problem 3AYK

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Skeletal muscles, which move bones, consist of cells fused into long fibers. These muscle fibers differ in how they make ATP. Red muscle fibers use aerobic respiration to generate ATP. Red muscle fibers have greater endurance because they can continue to generate ATP as long as they continue to get oxygen. White muscle fibers use anaerobic respiration to generate ATP. White muscle fibers can generate ATP very quickly for short bursts of energy but they cannot sustain this for long periods of time.

Red muscle fibers are darker in color than white muscle fibers. This difference in color is partially because red muscle fibers have many more mitochondria than white muscle fibers, and the mitochondria require a large number of myoglobin proteins. Myoglobin proteins help transport oxygen to the mitochondria and create the deep red color of red muscle fibers.

Which of the following statements correctly describes why white muscle fibers do not need as many mitochondria as red muscle fibers?

A. White muscle fibers use anaerobic respiration, which requires more efficient mitochondria than aerobic respiration.

B. White muscle fibers use anaerobic respiration, which does not occur in the mitochondria.

C. Mitochondria in the white muscle fibers are more efficient.

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