Key result
Frog slow muscle fibres differ from twitch fibres by having irregularly packed I filaments, no ordered Z line structure, absent M line cross-links, and a distinct sarcoplasmic reticulum network.
Authors
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Distinct filament packing in slow fibers may underlie tonic vs phasic contraction; leaves open functional mechanisms in mammalian muscle.
Sally Page (1965) studied this question. Frog slow muscle fibres vs. Frog twitch muscle fibres was evaluated on Fine structure of myofibrils and sarcoplasmic reticulum. Frog slow muscle fibres differ from twitch fibres by having irregularly packed I filaments, no ordered Z line structure, absent M line cross-links, and a distinct sarcoplasmic reticulum network.
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