Lec 3 Flashcards
How to change the membrane potential
Change the permeability by opening ion channels
Graded potentials
Occurs in axodendritic synapse and axosomatic synapse
Neurotransmitter released from presynaptic terminal causes ion channels to open
Excitatory synapses
Depolarize membrane
Inhibitory synapses
Hyperpolarize membrane
Graded potentials process
Neurotransmitter released from presynaptic terminal causes ion channels to open
This changes the membrane potential
Post synaptic potentials occur
Excitatory synapses
Na+ channel opens
Inhibitory synapses
Cl- channel is opened
What are ion channels dependent on
Chemical dependent
Ion channels are gated with what
Ligands
Electrotonic conduction
Charge spreading passively through cytoplasm causing depolarization of adjacent membrane
Decay of membrane potentials is due to
Leakage of charged ions across membrane
Electrical resistance of cytoplasm
Electrical properties of membrane
Two types of summation
Temporal summation
Spatial summation
Spatial summation
Summation of potentials over space
Temporal summation
Summation of potentials over time
