WordGarden.iohyperpolarization
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Meanings
Noun
an increase in the negative electrical potential across a cell membrane
enhanced polarization of particles or nuclei beyond ordinary thermal equilibrium
an extreme intensification of social or political polarization
Beyond the definition
Imagine your nerve cells as tiny batteries waiting to send messages. To send a signal, they need to reach a certain "spark" point. Usually, they rest at a steady level, but sometimes they need to be calmed down. This process pushes the cell's electrical state farther from that spark point by making the inside more negative.
Think of it as pressing an "extra-safe" button on a nerve cell. By making the cell more negative, it makes the cell less likely to fire. This is important for keeping the nervous system balanced. It helps control signaling, supports normal brain activity, and can prevent too much firing at once.
Hyperpolarization is a change in a cell's membrane potential that makes it more negative than its usual resting state. This makes the cell less likely to fire an action potential. In simple terms, it acts like a biological brake that slows or prevents activity. It is a basic process not only in neurons, but also in other excitable cells in the body.
Think of a neuron like a dam holding back a river. When the water level reaches the top (depolarization), the gates open and the signal rushes through. Hyperpolarization is like digging the floor of the dam deeper or raising the walls; it increases the distance the water must travel to overflow, making it much harder for the neuron to "fire."
This is not limited to the brain. It also happens in heart cells, where it helps control rhythm, and in muscle cells, where it can help support relaxation. In many cases, it happens when negatively charged ions such as chloride move into the cell, or when positively charged ions such as potassium move out. These ion movements change the electrical balance and make sudden activation less likely.
Examples
- 1
Ion channels
Opening these channels causes hyperpolarization in the neuron.
- 2
Action potential
After an action potential, a brief hyperpolarization makes the cell less likely to fire again.
- 3
Pain research
The researchers found that the drug reduced pain signals by prolonging hyperpolarization in sensory nerves.
See also
Similar
- increased membrane polarization
Shades of meaning
Contrast
- depolarization
- repolarization
Used with (collocations)
- membrane hyperpolarization
- neuronal hyperpolarization
- hyperpolarization-activated channels
Word family
- hyperpolarize
- hyperpolarized
Explore
- resting membrane potential
- inhibitory postsynaptic potential
Forms and spellings
1 form open this card.
Main spelling
- hyperpolarizationnoun