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Question
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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Solution
The red muscle fibres are thinner than the white muscle fibres. Their functionality can be extended for a longer period of time without becoming fatigued. They can function continuously for a long period of time due to the following factors:
When myoglobin is abundant, oxygen is readily available.
Their energy comes from aerobic respiration. As a result, they do not produce lactic acid in their muscles.
This means there is a large amount of stored ATP in these muscles because there are many mitochondria. Therefore, these muscles are able to work for a longer period of time.
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