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- W2022764512 abstract "1. The membrane potential of isolated muscle fibres in solutions containing tetrodotoxin (TTX) was controlled with a two-electrode voltage clamp. The striation pattern in the region of the electrodes was observed microscopically.2. With square steps of depolarization of increasing magnitude, contraction occurs first in the myofibrils just beneath the surface membrane, and then spreads inwards towards the axis of the fibre as the depolarization is increased.3. From the depolarizations which make the superficial and axial myofibrils contract it is possible to estimate a space constant (lambda(T)) for electrotonic spread in a transverse tubular network.4. lambda(T) was found to vary with fibre radius; for a 50 mu fibre it was about 60 mu. lambda(T) was not greatly affected by tetraethylammonium (TEA) chloride (111 mM), or by sucrose substitution of most of the sodium chloride in the Ringer solution.5. The ratio of the depolarization threshold for contraction of surface myofibrils and of central myofibrils was smaller for short (3 msec) than for long depolarization.6. Action potentials, recorded from a sartorius fibre, were used as the command signal for the voltage-clamped fibre in tetrodotoxin. The central myofibrils of this fibre did not appear to contract unless the imposed ;action potentials' were of normal size.7. The passive electrical characteristics of the transverse tubular system will just allow an action potential, at room temperature, to activate the myofibrils at the centre of a frog muscle fibre. An active potential change would be required to achieve a safety factor appreciably greater than one for this process." @default.
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- W2022764512 title "Radial spread of contraction in frog muscle fibres" @default.
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- W2022764512 doi "https://doi.org/10.1113/jphysiol.1969.sp008910" @default.
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