Lecture 4 Flashcards
gradient of electrochemical potential usually for an ion that can move across a membrane; consists of electrical potential and chemical concentration across a membrane
electrochemical gradient
difference in electric potential between the interior and exterior of a biological cell
membrane potential
formula for calculating the membrane potential based on internal and exterior concentrations of ion distributed differentially across a bilayer
nernst equation
helps maintain the resting potential and regulate cellular volume; responsible for about 1/5 of the cell’s energy energy expenditure except neurons (2/3 of neuron’s energy expenditure)
Na K ATPase
structure that permits a neuron nerve cell to pass an electrical or chemical signal to another cell
synapse
high intracellular concentration, low extracellular concentration
Potassium
low intracellular concentration, high extracellular concentration
Sodium
Movement of Na and K in NaK ATPase
3 Na Out, 2 K in
Ion channels show ion selectivity T/F
True
ion channels are continuously open T/F
False
pores show ion selectivity T/F
False
Types of channeling gating
voltage, ligand (intra and extracellular), and stress
action potentials are unidirectional T/F
True
membrane depolarization is caused by which ion
Na+
membrane repolarizes because of which ion
K+
