The portion of a nerve cell that conducts signals is called an axon. many of the electrical properties of axons are governed by ion channels, which are protein molecules that span the axon's cell membrane. when open, each ion channel has a pore that is filled with fluid of low resistivity and connects the interior of the cell electrically to the medium outside the cell. in contrast, the lipid-rich cell membrane in which ion channels reside has very high resistivity. in a simple model of an axon conducting a nerve signal, ions move across the cell membrane through open ion channels, which act as purely resistive elements. assume that a typical open ion channel spanning an axon's membrane has a resistance of 1×1011ω.
if a typical current density (current per unit cross-sectional area) in the cell membrane is 5 ma/cm2 when the voltage across the membrane (the action potential) is 50 mv, what is the number density of open ion channels in the membrane?
if a typical current density (current per unit cross-sectional area) in the cell membrane is 5 when the voltage across the membrane (the action potential) is 50 , what is the number density of open ion channels in the membrane?
1/cm2
10/cm2
10/mm2
1/μm2
Answers: 1
Physics, 22.06.2019 06:50, saltytaetae
What is the stall speed at sea level of an airplane that weights 10000 lbs., has a wing area of 300ft^2, and a maximum lift coefficient of 1.4? what is the stall speed if flaps that double cl, max are applied?
Answers: 1
Physics, 22.06.2019 19:40, mcmccann4317
It may seem strange that the selected velocity does not depend on either the mass or the charge of the particle. (for example, would the velocity of a neutral particle be selected by passage through this device? ) the explanation of this is that the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line and will not pass through the exit slit. if the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. because the acc
Answers: 1
The portion of a nerve cell that conducts signals is called an axon. many of the electrical properti...
Mathematics, 12.03.2020 01:45
Mathematics, 12.03.2020 01:45