tonicity

The heart is a muscular organ possessing certain properties, rhythmicity, excitability, contractility, conductivity and tonicity, as pointed out by Gaskell, in virtue of which it is able to maintain a regular automatic beat independently of nerve stimulation.

The intestine loses its tonicity; it no longer has power to contract upon or to expel its contents; it becomes paralysed, and the dung consequently accumulates within it, distending it, and adding to its weakness by constant tension.

The abdominal walls lose their tonicity because they are so compressed that they cannot have a perfect circulation, the bowels sink down still further into the pelvis, and pull upon their attachment in the small of the back, creating backache.

He had nearly doubled in weight and in lung capacity and a large part of his increased weight was in great bulk of muscle of high tonicity—muscle which he had gained by heavy physical work upon a ranch.

His sexual organs had completely regained their tonicity and without doubt, their virility.