ELECTRICAL AND MECHANICAL CHARACTERISTICS OF A VERY FAST LOBSTER MUSCLE

doi:10.1083/jcb.42.2.548

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ARTICLE

ELECTRICAL AND MECHANICAL CHARACTERISTICS OF A VERY FAST LOBSTER MUSCLE

Martin Mendelson ¹

¹ From the Department of Physiology and Biophysics, New York University School of Medicine, New York 10016, and The Marine Biological Laboratory, Woods Hole, Massachusetts 02543

The remotor muscle of the second antenna of the American lobsteris functionally divided into two parts. One part produces slow,powerful contractions and is used for postural control. Theother part produces very brief twitches, can follow frequenciesover 100/sec without fusion and is probably used for sound production.This great speed is due, in part, to synchronous arrival ofnerve impulses at multiple terminals, a very brief membraneelectrical response and electrical continuity throughout largevolumes of sarcoplasm. Calculations indicate that the very extensivesarcoplasmic reticulum is probably responsible for the rapiddecline of tension in this muscle.

Submitted on October 22, 1968
Revised on April 8, 1969

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