Hydrodynamic Properties of Water in Contractile System
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When muscle fragments are compressed, intracellular water leaks out. Unexpectedly, y-intercepts of regression lines in resting and active states become negative, implying “negative compression”. It seems that in resting state there is a kind of mechanical equilibrium between proteins and water. This protein-water complex in muscle behaves like a synthesized elastomer under moderate extension, (less than 10%). Employing the data presented by Richie & Wilkie (1958), validity of elastomer model is examined.
Compression study also shows that in active state a frictional drag of intracellular water decreases markedly. It leads to the assumption that the negative mechanical resistance may play a role in regenerative activation.
KeywordsModerate Extension Relaxation Oscillation Mechanical Equilibrium Intracellular Water Frictional Drag
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