How many ions move through the membrane

Reference no: EM13291167

The potential difference across a cell membrane from outside to inside is initially at -90 mV (when in its resting phase). When a stimulus is applied, Na+ ions are allowed to move into the cell such that the potential changes to +20mV for a short amount of time.

(a) If the membrane capacitance per unit area is 1 uF/cm^2, how much charge moves through a membrane of area 0.05 cm^2?

(b) The charge on Na+ is e+. How many ions move through the membrane?

Reference no: EM13291167

Questions Cloud

Find the charges and the electric fields everywhere : A hollow conducting sphere is surrounded by a large concentric, spherical, Using Gauss's Law, find the charges and the electric fields everywhere

Determine the ionospheric zenith delay from dual-frequency : Determine the ionospheric zenith delay from dual-frequency measurement over a 24-hour period and observe the variabilty as afunction of local time. use the data set: the solar cycle was closeto to its peak on SEP 18 2000

Estimate the initial speed of the car : Police investigators, examining the scene of an accident involving two cars, measure 72 -long skid marks of one of the cars, Estimate the initial speed of the car assuming a level road

What value ofcapacitance placed in parallel with load : A particular load has a pf of 0.8 lagging. The power deliveredto the load is 40 kW from a 270-V rms 60-Hz line. What value ofcapacitance placed in parallel with the load will raise the pf to0.9 lagging

How many ions move through the membrane : The potential difference across a cell membrane from outside to inside is initially at -90 mV (when in its resting phase). How many ions move through the membrane

What will the nominal yield be : Low Corp. has a bond with annual interest payments of $109 maturing in 10 years at a value of $1,000 per bond. The current market price is $960. What will the nominal yield be?

Define what are the ph and alkalinity of the three solutions : What are the pH and alkalinity of these three solutions immediately after you make them

Calculate the voltage drop between two potential probes : A current of 2 A flows through a slab of tin, 1 mm thick and 2mm wide, whose conductivity is 106 1/Ωm. Calculate the voltage drop between twopotential probes that are 10 cm apart along the slab.

What is the expected dividend yield and expected capital : what is the expected dividend yield and expected capital gains yield for the coming year?

User Account

All Pages