Neuron Membrane Potentials Flashcards
Graded potentials are in response to
Input
Graded potentials occur in the
- Dendrites
- Soma
The size and duration of graded potentials is determined by
Excitatory and inhibitory inputs
Graded potentials do not move onto
Axons
Which potentials are found in axons?
Action potential
Action potentials start at the
Trigger zone
Action potentials start when the
Summation of graded potentials brings the membrane past the threshold potential
Action potential is formed when the potential goes from
-70mV to -50mV
Summation is how neurons
Process information from inputs
Neurons respond to inputs from other neurons via
Neurotransmitters released at synapses
Excitatory / inhibitory input depends on the
Type of neurotransmitter and receptor
What are Synaptic potentials?
Graded potentials produced from a synapse
What are Receptor potentials?
Potentials generated by stimuli / sensory receptors
Depolarization happens when the
Graded potential moves the membrane towards 0
How is the membrane during depolarization?
Less polarized / less charge separation
Excitatory potentials are found during
Depolarization
Hyperpolarization is when there is a
Graded potential that moves membrane away from 0
During Hyperpolarization, how is the cell?
It has increased polarization / charge separation
An Inhibitory potential decreases the
Chances of action potential generation
Graded potentials decay with
Time and distance
Spatial Summation involves
Multiple neurons
Action potentials begin with the
Summation of graded potentials getting it to threshold value
How is the plateau for action potentials?
Short
