During the absolute refractory period, what is the most likely state of the voltage-gated sodium and potassium channels?Group of answer choicesBoth sodium and potassium channels are open.Sodium channels are closed and potassium channels are open.Sodium channels are open and potassium channels are closed.Both sodium and potassium channels are closed.
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During the ________ refractory period it is impossible to fire another action potential because ________. absolute :voltage gated sodium channels are already open or their inactivation gates are closed absolute : voltage gated potassium channels are open relative :voltage gated chloride channels are open hyperpolarizing the cell relative :voltage gated sodium channels are already open relative :voltage gated calcium channels are open
Sri K.
What is the usual state of voltage-gated ion channels during the rising phase of the action potential? Voltage-gated Sodium channels are mostly open, Voltage-gated potassium channels are mostly open Voltage-gated Sodium channels are mostly closed, Voltage-gated potassium channels are mostly open Voltage-gated Sodium channels are mostly inactivated, Voltage-gated potassium channels are mostly open Voltage-gated Sodium channels are mostly open, Voltage-gated potassium channels are mostly closed Voltage-gated Sodium channels are mostly closed, Voltage-gated potassium channels are mostly closed Voltage-gated Sodium channels are mostly inactivated, Voltage-gated potassium channels are mostly closed Which of the following are characteristics of individual voltage-gated sodium channels, as investigated by patch-clamp techniques? Select all that applly. Open a matter of milliseconds (ms) after depolarization is applied. Always produce a current of the same size (magnitude) in response to the same membrane potential whenever they are open (ie, there are no differences in ion flux between different ion channels of the same type) Transition between 0 and maximal current near-instantaneously (ie, they have a square current waveform) Typically don't re-open after closing, even if depolarization is maintained. Only allow current to flow while in the open state.
Shaiju T.
During the late absolute refractory period of an action potential, the voltage-gated Na+ channels are closed and cells are hyper-excitable. In the relative refractory period, the voltage-gated K+ channels are active and cells are more excitable. Only smaller action potentials are achievable. Most voltage-gated Na+ channels have reset and cells are not excitable. Most voltage-gated Na+ channels are inactivated and cells are not excitable.
Mystique T.
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