In physiology, medicine, and anatomy,<unk>  (residual<unk>  tension or tonus) is the continuous and passive partial contraction of the<unk> s, or the<unk> 's resistance to passive stretch during resting state. It helps to maintain posture and declines during REM sleep.
Muscle tone
Myogenic tone
Electrodermal activity
Pain tolerance
Physical strength
Vasoactivity
Myocardial contractility
Cardiac cycle