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


Red muscle fibres in animals can work for more extended periods continuously as it has myoglobin, which is an oxygen transporting pigment. It gets bound to the oxygen molecule and stored as oxymyoglobin. During the muscle contraction, which occurs during extended periods of continuous work, the stored oxymyoglobin releases oxygen.


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