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lect fin fall 2020

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ackman678
2020-12-14 10:18:11 -05:00
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neurophysiology2.md
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@@ -159,6 +159,10 @@ If you command that the cell membrane potential be hyperpolarized, you get very
This is because the cell membrane essentially acts as a parallel RC circuit where a resistor and a capacitor are connected in parallel and to a constant current source. Ion channels are resistors, lipid bilayer with the extracellular and intracellular environments act as capacitor, storing charge in the form of ions accumulating near the surface of the membrane. When a switch is turned on in an RC circuit current flows from the battery to the capacitor until the capacitor is charged to a voltage that is same as the battery.
: capacitance of membrane: during change in applied voltage or current across membrane, positively charged ions pile on surface of one side of membrane and **electrostatically** interact with cations on the other side of membrane surface (membrane acts as thin impermeable surfaces in parallel, like a capacitor), repeling them and inducing immediate, fast capacitive current along membrane
However when Hodgkin and Huxley depolarized the membrane, a transient inward current occurs followed by a slow outward current.