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- W2078092511 abstract "Abstract 1. 1. Nereis pharangeal visceral muscle is composed of obliquely striated fibres with low mitochondrial density and moderately developed sarcoplasmic reticulum. 2. 2. Isolated mitochondria and sarcoplasmic reticulum showed moderate passive calcium binding but only low ATP-promoted calcium binding which was inhibited by caffeine. 3. 3. Whole fibres preloaded with Ca45 showed a two compartment efflux. The slow, presumably intracellular, compartment accounted for only 10% of total Ca45 activity. 4. 4. Both acetylcholine and high KCl treatments stimulated calcium influx, causing contractures while calcium-free and EGTA treatments inhibited both these contractures and normal spontaneous contractions. 5. 5. Lanthanum inhibited normal contractility and KCl contractures. Lanthanum also inhibited Ca45 influx but was without effect on Ca45 efflux. 6. 6. It is concluded that there is little calcium storage capacity in these visceral muscle fibres and that normal contractions are strongly dependent upon extracellular calcium influx." @default.
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- W2078092511 date "1981-01-01" @default.
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- W2078092511 title "Calcium binding by sarcoplasmic reticulum and mitochondria isolated from an annelid visceral muscle in relation to whole muscle calcium influx and efflux" @default.
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- W2078092511 doi "https://doi.org/10.1016/0300-9629(81)90369-8" @default.
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