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Hypertonia is a medical condition that is characterized by increased muscle tension, which causes muscles to have difficulty stretching. Hypertonia is often referred to as abnormal muscle stiffness and is common in diseases such as cerebral palsy, although it can develop with no known cause.
Hyperpolarization is a change in a cell's membrane potential that makes it more negative. It is the opposite of a depolarization.It inhibits action potentials by increasing the stimulus required to move the membrane potential to the action potential threshold.Hyperpolarization is often caused by efflux of K+ through K+ channels, or influx of Clâ through Clâ channels.t is the opposite of a depolarization. It inhibits action potentials by increasing the stimulus required to move the membrane potential to the action potential threshold. Hyperpolarization is often caused by efflux of K+ through K+ channels, or influx of Clâ through Clâ channels.