The lateroventral muscles of Glomeris marginata keep the animal rolled up and are able to develop and maintain great tension. Their fibers are not equipped with a particularly strong contractile apparatus but can supercontract. The sarcomere shortens its resting length by up 60% and in a typical supercontraction the thick filaments pass through the Z-line into adjacent sarcomeres. The Z-line structure changes according to the contraction state: It passes from a homogeneous, dense zig-zag line in decontracted fibers to a rarified, vaguely outlined Z-band in supercontracted fibers, in which it is possible to see actin and myosin filaments. The Z-line is thus involved in an active expanding process and is functionally very different from the fragmented and discontinuous Z-line of 'classical' supercontracting muscles. The different meaning of the two cases of supercontraction is discussed.
Active supercontraction in rolling-up muscles of Glomeris marginata. / M.D. Candia Carnevali, R. Valvassori. - In: JOURNAL OF MORPHOLOGY. - ISSN 0362-2525. - 172:1(1982 Apr), pp. 75-82.
|Titolo:||Active supercontraction in rolling-up muscles of Glomeris marginata.|
CANDIA, MARIA DANIELA (Primo)
|Settore Scientifico Disciplinare:||Settore BIO/05 - Zoologia|
|Data di pubblicazione:||apr-1982|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1002/jmor.1051720107|
|Appare nelle tipologie:||01 - Articolo su periodico|