单词 | mV |
例句 | "However, the electrical potential began to fluctuate after raining, sometimes going over 100 mV." Mushrooms can "talk" to each other — and they get extra chatty after a rain, study suggests 2023-05-09T04:00:00Z The separation of charge creates a potential difference of 70 to 90 mV across the cell membrane. College Physics for AP Courses 2015-08-12T00:00:00Z Once the sodium channels open, the neuron completely depolarizes to a membrane potential of about +40 mV. Biology for AP Courses 2022-06-09T00:00:00Z Repolarization returns the membrane potential to the -70 mV value that indicates the resting potential, but it actually overshoots that value. Anatomy and Physiology 2013-06-19T00:00:00Z The exact value measured for the resting membrane potential varies between cells, but -70 mV is most commonly used as this value. Anatomy and Physiology 2013-06-19T00:00:00Z For a membrane at the resting potential, a graded potential represents a change in that voltage either above -70 mV or below -70 mV. Anatomy and Physiology 2013-06-19T00:00:00Z Now, if the exterior of a neuron is taken to be at 0 V, then the interior has a resting potential of about –90 mV. College Physics for AP Courses 2015-08-12T00:00:00Z Because the inside of a cell is negative compared with the outside, a minus sign signifies the excess of negative charges inside the cell, −70 mV. Biology for AP Courses 2022-06-09T00:00:00Z Potassium ions reach equilibrium when the membrane voltage is below -70 mV, so a period of hyperpolarization occurs while the K+ channels are open. Anatomy and Physiology 2013-06-19T00:00:00Z The resting potential is the state of the membrane at a voltage of -70 mV, so the sodium cation entering the cell will cause it to become less negative. Anatomy and Physiology 2013-06-19T00:00:00Z The membrane potential will reach +30 mV by the time sodium has entered the cell. Anatomy and Physiology 2013-06-19T00:00:00Z There is a potential difference across the membrane of about –70 mV . College Physics for AP Courses 2015-08-12T00:00:00Z The channels that start depolarizing the membrane because of a stimulus help the cell to depolarize from -70 mV to -55 mV. Anatomy and Physiology 2013-06-19T00:00:00Z Any depolarization that does not change the membrane potential to -55 mV or higher will not reach threshold and thus will not result in an action potential. Anatomy and Physiology 2013-06-19T00:00:00Z Also, any stimulus that depolarizes the membrane to -55 mV or beyond will cause a large number of channels to open and an action potential will be initiated. Anatomy and Physiology 2013-06-19T00:00:00Z One is the activation gate, which opens when the membrane potential crosses -55 mV. Anatomy and Physiology 2013-06-19T00:00:00Z When the membrane potential passes -55 mV again, the activation gate closes. Anatomy and Physiology 2013-06-19T00:00:00Z At this point, calcium ion channels open and Ca2+ enters the cell, further depolarizing it at a more rapid rate until it reaches a value of approximately +5 mV. Anatomy and Physiology 2013-06-19T00:00:00Z With the ions distributed across the membrane at these concentrations, the difference in charge is measured at -70 mV, the value described as the resting membrane potential. Anatomy and Physiology 2013-06-19T00:00:00Z When the membrane potential reaches approximately −60 mV, the K+ channels close and Na+ channels open, and the prepotential phase begins again. Anatomy and Physiology 2013-06-19T00:00:00Z This rapid influx of positively charged ions raises the membrane potential to approximately +30 mV, at which point the sodium channels close. Anatomy and Physiology 2013-06-19T00:00:00Z Contractile cells demonstrate a much more stable resting phase than conductive cells at approximately −80 mV for cells in the atria and −90 mV for cells in the ventricles. Anatomy and Physiology 2013-06-19T00:00:00Z |
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