If the membrane capacitance instead increases at 9.2
the capcitance of the membrane is 1 F
the number of vesicles that fuse are = 1 f /9.2
The capacitance of the cell membrane is estimated to be 89 pF, and approximately 10000 Na+ ions flow through an ion channel when it opens. 1. Based on this information and what you learned in this chapter about the action potential, estimate the total number of sodium ion channels in the membrane of a nerve cell. Express your answer using two significant figures. (N = ???)
3) Electrical model of a cell membrane Consider a piece of cell membrane. The membrane has a specific conductivity of Om = 10-10 (12 cm)', a dielectric constant Em = 8 and thickness dm = 7.5 nm. On both sides of the membrane are two boundary layers with equal specific conductivity Op = OL = 102 (2 cm)-1. The thickness of these layers is dp = 50 nm and di = 100 nm and their capacitance is negligible. a) What...
What happens to the electric field as capacitance increases? What happens to the electric field as the voltage supplied by the battery increases?
(a) Find the capacitance of the cell membrane. (b) Suppose the potential difference across the cell wall is 92 mV. Find the magnitude of the charge stored on either side of the cell wall. hboard> My courses > Spring Semester 2019 SP2019-PHYS-142-001 Topic 3 HW CH18.2 Capacitance due 1/22 Question 3 Partially correct 0.33 points out of 1.00 The fuids Inside and outside a cell are good conductors separated by the cell wall, which is a dielectric. Thus the cell...
Three capacitors are connected in series. If one capacitor is removed, the equivalent capacitance increases?
The dielectric in a capacitor serves two purposes. It increases the capacitance, compared to an otherwise identical capacitor with an air gap, and it increases the maximum potential difference the capacitor can support. If the electric field in a material is sufficiently strong, the material will suddenly become able to conduct, creating a spark. The critical field strength, at which breakdown occurs, is 3.0 MV/m for air, but 60 MV/m for Teflon. A parallel-plate capacitor consists of two square plates...
In some cases, the excited membrane does not immediately repolarize after depolarization. Instead, the potential remains on a plateau near the peak of the spike potential for some milliseconds, then depolarization begins. This happens in the cardiac muscle fibers (0.2 to 0.3 second delay) due to what type of channels? Explain using the principle of all-or-nothing, absolute refractory period and the directionality of propagation of an action potential.
The intracellular resistance of a nerve cell is 8.2*106 Ω/cm (ri). Resistance of the cell membrane is 1.5*104 Ωcm and capacitance 12 nF/cm (cm). Calculate the intracellular resistance and resistivity and membrane capacitance of the axon.
A 2.5 nF parallel-plate capacitor has an air gap between its plates. Its capacitance increases by 2.5 nF when the gap is filled by a dielectric What is the dielectric constant of that dielectric?
Setting the alpha level at 0.001 instead of the usual 0.05 increases the likelihood of type II error type I error rejecting the null hypothesis having a small n