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Answer for the clue "The elastic tension of living muscles, arteries, etc. that facilitate response to stimuli ", 8 letters:
tonicity

Word definitions for tonicity in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Tonicity \To*nic"i*ty\, n. (Physiol.) The state of healthy tension or partial contraction of muscle fibers while at rest; tone; tonus.

Wikipedia Word definitions in Wikipedia
Tonicity is a measure of the effective osmotic pressure gradient, as defined by the water potential of two solutions separated by a semipermeable membrane . In other words, tonicity is the relative concentration of solutions that determine the direction ...

Wiktionary Word definitions in Wiktionary
n. 1 (context medicine English) The normal presence of tone or tension in a muscle or organ; tonus 2 (context sciences English) The ability of a solution to exert an osmotic pressure upon a membrane

WordNet Word definitions in WordNet
n. the elastic tension of living muscles, arteries, etc. that facilitate response to stimuli; "the doctor tested my tonicity" [syn: tonus , tone ] [ant: atonicity ]

Usage examples of tonicity.

When the spermatic veins are over-distended to such an extent that their tonicity is impaired, they gradually lose their capacity for transmitting the blood, and a slowly increasing enlargement and tortuously of veins results.