Question

Why do red muscle fibres have less sarcoplasmic reticulum?

Answer 1

to facilitate a slower release of calcium regulating muscle contraction at slower rates

Answer 2

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They are usually found in red muscles, indicative of the large concentration of myoglobin providing a steady supply of oxygen to them. Also, slow-twitchfibers contain less sarcoplasmic reticulum, facilitating a slower release of calcium, regulating musclecontraction at slower rates.



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