Lecture 4. Neural Conduction and Synaptic Transmission Flashcards
difference in electrical charge between the inside and outside of the cell
Membrane Potential
Membrane potential is measured with the use of?
Microelectrodes
Resting membrane potential is measured as about?
-70 mV charge
Resting potential neuron state is said to be?
Polarized, it has a membrane potential that is nor zero
In resting ions, there are?
more Na+ ions outside than inside of the cell, more K+ ions inside than outside
specialized pores in the neural membrane
ion channels
each type of ion channel is?
specialized for the passage of particular ions
What is the pressure on Na+ ions?
there is substantial pressure in Na+ ions to enter the resting neurons
2 types of Pressure
Electrostatic pressure from resting membrane potential - because opposite charges attract, the positively charged Na+ ions are attracted to -70 mV charge inside resting neurons
Pressure from random motion - for Na+ ions to move down their concentration gradient
A transporter discovered by Alan Hodgkin and Andrew Huxley in 1950s
Sodium-Potassium Pumps
such ion transport is performed by mechanisms that continually exchange?
three na+ ions inside the neuron for twi k+ ions outside
disturbance of resting membrane potential
Postsynaptic Potentials (PSPs)
2 Effects when Neurotransmitters are released
Depolarize Receptive Membrane & Hyperpolarize Receptive Membrane
Depolarize Receptive Membrane
decreasing the resting membrane potential
Postsynaptic Depolarization is aka
Excitatory Postsynaptic Potentials
