Resting membrane potential
What is largely responsible for the negative resting membrane potential (around -70 mV) in a neuron?
Potassium leak currents
Ions are atoms or molecules that carry an electric charge due to the gain or loss of ____
electrons
The lipid bilayer portion of the membrane ______
is impermeable to most polar molecules and ions
Ion channels are made of____
protein
The sodium-potassium pump is responsible for ________
pushing three sodium ions out of the cell for every two potassium ions pumped in, and returning the membrane potential to the resting state
For a typical animal cell, the membrane potential is determined by the equilibrium distribution of K+ ions across the cell membrane. Free movement of K+ across the membrane occurs through _______________
the K+ leak channel
When the neuron expels potassium ions ___________
the inside of the cell loses positive ions and produces a negative charge inside
The equilibrium potential for potassium is about ______ mV
-80
When the charge across the membrane of a neuron is between _____________, the charge is called the __________ This is due to an ___________
60 and 70 mV; resting potential; efflux of positive ions
Which of the following statements best describes the neural membrane during the resting phase?
All of the voltage gated sodium and potassium channels are closed