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Journal of Experimental Biology, Vol 115, Issue 1 69-78, Copyright © 1985 by Company of Biologists

JOURNAL ARTICLES

From sarcomeres to whole muscles

DL Morgan

The series connection of sarcomeres in a muscle raises the possibility of instabilities due to some sarcomeres being capable of greater isometric tension than others, due to non-uniform activation, cross-sectional area or sarcomere length. Such instabilities are heavily damped by the force-velocity curve and stabilized by passive tension. The variation of active tension with sarcomere length may act to stabilize or destabilize the situation. Such instabilities can affect tension in a complex manner, causing both increases and decreases in different situations. Some examples of situations where sarcomere nonuniformities have been observed or inferred are given, and their mode of action explained.




© The Company of Biologists Ltd 1985