Tonic (physiology)

Tonic (physiology)

Tonic (pronunciation: /ˈtɒnɪk/), in the field of physiology, refers to a state of continuous muscle contraction. The term is derived from the Greek word "tonos", which means tension or tone.

Etymology

The term "tonic" is derived from the Greek word "tonos" (τόνος), which translates to "tension" or "tone". It was first used in the context of physiology in the 19th century to describe the continuous contraction of muscles.

Related Terms

• Muscle Tone: The continuous and passive partial contraction of the muscles, which helps to maintain posture.
• Tonicity: The ability of a solution to cause a cell to gain or lose water.
• Tonic Receptor: A type of sensory receptor that adapts slowly to a stimulus and continues to produce action potentials over the duration of the stimulus.
• Tonic Inhibition: A form of neuronal regulation that results in a continuous decrease in the excitability of neurons.

See Also

• Phasic (physiology)
• Muscle Contraction
• Neurophysiology

External links

• Medical encyclopedia article on Tonic (physiology)
• Wikipedia's article - Tonic (physiology)

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