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News Physiol Sci 3: 124-128, 1988;
1548-9213/88 $5.00
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News in Physiological Sciences, Vol 3, 124-128, Copyright © 1988 by International Union of Physiological Sciences

ARTICLES

Muscle Cells of Hollow Organs

RA Murphy

Muscle cells in hollow organs must shorten and perform work much like skeletal muscle. However, they must also contract tonically to maintain organ dimensions against imposed loads. Vertebrate smooth muscle has a regulatory system involving Ca2+-stimulated cross-bridge phosphorylation that controls not only the number of cross bridges interacting with the thin filament but also controls their cycling rates. Regulation by phosphorylation and dephosphorylation lowers the efficiency of smooth muscle but contributes to a remarkable economy of force maintenance.


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