depolarization definition psychology
a decrease in the difference in voltage between the inside and outside of the neuron, a decrease in the difference in voltage between the inside and outside of the neuron. Definition noun The deprivation or the process of neutralization of polarity, as that in nerve cells Supplement Depolarization is the process or the act by which polarity is eliminated. There are drugs, called depolarization blocking agents, that inhibit depolarization, e.g. Can you spell these 10 commonly misspelled words? When a neuron is depolarized, it is more likely to fire an action potential. What made you want to look up depolarization? In the process of depolarization, the negative internal charge of the cell temporarily becomes more positive (less negative). As described at the top of this page, depolarization is any change in membrane potential that changes the value of the membrane potential to be closer to zero. It may also refer to the result of such action so that the result is an unpolarized condition. When a cell is at rest, the cell maintains what is known as a resting potential. Published by Houghton Mifflin Company. If the sum of the stimuli reaches a certain voltage, known as the threshold potential, depolarization continues from the axon hillock down the axon. The stimuli that have traveled down the dendrites converge at the axon hillock, where they are summed to determine the neuronal response. See Hyperpolarization for additional comparison of the correct and vernacular usage of the terms "depolarization" and "hyperpolarization". How to use depolarization in a sentence. Rod cells in the depolarized state constantly release neurotransmitters which in turn stimulate the nerves associated with rod cells. During depolarization, the membrane potential rapidly shifts from negative to positive. In the study of membrane potentials, particularly in the field of action potentials, depolarization has taken on an informal, technically incorrect meaning. All material within this site is the property of AlleyDog.com. When the 206 circuit is struck by electric waves there is an increase in the currents due to the depolarization of the circuit. 'Nip it in the butt' or 'Nip it in the bud'? For this rapid change to take place within the interior of the cell, several events must occur along the plasma membrane of the cell.
Similarly, studies have shown that after deliberating together, mock jury members often decided on punitive damage awards that … If a cell has a resting potential of -70mV and the membrane potential changes to -50mV, then the cell has been depolarized. ). Look it up now! 'All Intensive Purposes' or 'All Intents and Purposes'? After a cell has been depolarized, it undergoes one final change in internal charge. This shift from a negative to a more positive membrane potential occurs during several processes, including an action potential. Endothelial cells within blood vessels can alter the strength of their structure to maintain the vascular tone of the blood vessel they line, prevent vascular rigidity, and even help to regulate blood pressure within the cardiovascular system. The cell uses ion channels, ion pumps, and voltage-gated ion channels to generate a negative resting potential within the cell. movement closer to zero from resting membrane potential). The sodium potassium pump is largely responsible for the optimization of conditions on both the interior and the exterior of the cell for depolarization. For example, a group of women who hold moderately feminist views tend to demonstrate heightened pro-feminist beliefs following group discussion. Also called the rising phase, when positively charged sodium ions (Na+) suddenly rush through open voltage-gated sodium channels into a neuron. In the rod cells, this depolarization is maintained by ion channels that remain open due to the higher voltage of the rod cell in the depolarized state. Despite it being technically incorrect, text books often use the vernacular definition of "depolarization" (membrane potential change in the depolarizing direction from the resting potential) in their descriptions of electrophysiology. a person who has learned a subject without the benefit of a teacher or formal education. Get the word of the day delivered to your inbox, © 1998-, AlleyDog.com. To withstand these cardiovascular forces, endothelial cells must simultaneously have a structure capable of withstanding the forces of circulation while also maintaining a certain level of plasticity in the strength of their structure. When a cell is at rest, the cell maintains what is known as a resting potential.The resting potential generated by nearly all cells results in the interior of the cell having a negative charge compared to the exterior of the cell. Post the Definition of depolarization to Facebook, Share the Definition of depolarization on Twitter. Although there is an excessive amount of potassium in the cell and sodium outside the cell, the generated resting potential keeps the voltage-gated ion channels in the plasma membrane closed, preventing the ions that have been pumped across the plasma membrane from diffusing to an area of lower concentration. After a cell has established a resting potential, that cell has the capacity to undergo depolarization. The act of depriving of polarity, or the result of such action; reduction to an unpolarized condition.
Depolarization The animation below illustrates how the flow of positively charged ions into the axon leads the axon to become positively charged relative to the outside. However, the process of generating the resting potential within the cell also creates an environment outside the cell that favors depolarization. In the study of membrane potentials, particularly in the field of action potentials, depolarization has taken on an informal, technically incorrect meaning.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Please tell us where you read or heard it (including the quote, if possible). An inhibitory stimulus is transmitted to the dendrite of a neuron, causing hyperpolarization of the neuron.
The initial depolarization during the rising phase of an action potentia… For understanding the action potential, the resting potential is more important than the mathematically significant potential of zero. The act of depriving of polarity, or the result of such action; reduction to an unpolarized condition. Depolarization definition is - the process of depolarizing something or the state of being depolarized. The resting potential generated by nearly all cells results in the interior of the cell having a negative charge compared to the exterior of the cell. During an action potential, the depolarization is so large that the potential difference across the cell membrane briefly reverses polarity, with the inside of the cell becoming positively charged. Being a member of a group means that there is an opportunity to be exposed to novel arguments regarding an issue— arguments that can help reinforce and strengthen an individual’s initial position, producing movement toward the extremes. Depolarization is a change in a cell's membrane potential, making it more positive, or less negative, and may result in generation of an action potential. The opposite of a depolarization is called a hyperpolarization. Psychopharmacology
The change in charge typically occurs due to an influx of sodium ions into a cell, although it can be mediated by an influx of any kind of cation or efflux of any kind of anion. (Index, Outline). Psychology Definition of DEPOLARIZATION: A reduction in the potential of a cell, usually a neuron. For action potentials, a major concern is changes in membrane potential from the resting potential. Salters-Nuffield Advanced Biology for Edexcel A2 Biology. The sodium potassium pump works continuously throughout this process.
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