"Evolution has removed the ability of muscle cells to contract and changed the distribution of proteins in the cell membrane; now all electrocytes
do is push ions across a membrane to create a massive flow of positive charge," said Lindsay Traeger, U-W graduate student and co-author of the study.
produces a sexually dimorphic signal in South American fish Hypopomus occidentales (gymnotiformes, Hypopomidae).
1:30 DISTRIBUTION OF OXIDATIVE AND GLYCOLYTIC ENZYMES IN ELECTROCYTES
OF PHYLOGENTICALL DIVERSE SPECIES OF FISH.
that retain electrical responsiveness to presynaptic stimulation can be isolated from skate electric organ following collagenase treatment at room temperature (Fox et al., 1990).
They found that the dimmer switch comes in the form of sodium channels the fish insert and remove from the membranes of special cells, called electrocytes
, within their electric organs.
Electric fish generate energy and produce an electric current from electrocytes
which are derived from muscle tissue.
The organ consists of approximately 8,000-10,000 cup- or disk-shaped electrocytes
arranged anteroposteriorly in series (Ewart, 1892; Brock et aL, 1953; D.