Why can red muscle fibres work for longer periods continuously?

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Solution

Red muscle fibres work for longer periods continuously because they contain abundant myoglobin, the pigment which stores oxygen. They can, therefore, continue work over long periods by using myoglobin stored oxygen and hence performing aerobic respiration. White muscle fibres have less myoglobin.

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It is known that red muscle fibres in animals can work for longer periods of time continuously. How is this possible?

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