tonus

Mental arousal with physical activity might increase peristaltic tonus of the bowel’s smooth muscles. which might become flaccid with a placid temperament and an unstimulating indoor environment.

This tonus is essential to the maintenance of an equalized circulation.

He drove powerfully with his wings, felt tonus across his back, shot forward and up.

The pyramidal tract conveys impulses that inhibit muscle tonus, while the rubro-spinal tract is the path by which excitatory impulses travel.

And, of course, one should feel something if it is no more than the tonus of muscle against the mobile bones.