Refractory period
Refractory Period
The Refractory Period (/rɪˈfræktəri ˈpɪəriəd/), from the Latin refractarius meaning "stubborn, unmanageable", is a term used in various fields of medicine to describe a period of time during which a system is unable to respond to further stimulation.
In Cardiology
In cardiology, the refractory period refers to the time period during which the heart cannot respond to further stimulation. This is due to the fact that the cardiac cells are either in the process of repolarizing or have just repolarized. This period is crucial for preventing premature contractions and maintaining a regular heart rhythm.
In Neurology
In neurology, the refractory period is the time after an action potential during which a neuron cannot generate another action potential. This is due to the fact that the neuron is either in the process of repolarizing or has just repolarized. This period is crucial for preventing continuous firing of the neuron and maintaining a regular firing pattern.
In Sexual Health
In sexual health, the refractory period refers to the recovery phase after orgasm during which it is physiologically impossible for an individual to have additional orgasms. This period varies greatly among individuals, ranging from minutes to days.
Related Terms
- Absolute refractory period: The time during which a second action potential is impossible, no matter how strong the stimulus.
- Relative refractory period: The time following the absolute refractory period when a stronger than normal stimulus is required to initiate an action potential.
- Hyperpolarization: An increase in the cell's membrane potential, making it more negative and less likely to fire an action potential.
- Depolarization: A decrease in the cell's membrane potential, making it less negative and more likely to fire an action potential.
External links
- Medical encyclopedia article on Refractory period
- Wikipedia's article - Refractory period
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