T1 U3 Neurophysiology Flashcards
The 4 basic electrical principles of the body are
Body electrically neutral
One type charge dominates
Opposites attract and this energy used to separate
Opposites together liberate energy
What is a neuron called when it is inactive
Polarized
Which ion is largely found outside the cell k+ or Na+
Na+
What is the difference between; voltage,
Potential, resistance, current
Voltage: measure potential energy generated by separate charge
Potential: measures difference in 2 points
Current: flow of charge between 2 points
Resistance: resistance to flow of charge
Formula for relation ship of charge is
V = r/I
R = v x I
I = v/r
C
What happens when gated ion channels open
Ions diffuse across the gradient
What is the electrical gradient
Movement to area of charge
How is the RMP stabilized
Sodium potassium pump
Membrane potential acts as…
An impulse ornsignal
Name the 2 MP signal types
Graded potential
Action potential
Where do action potentials take place
In the axon
Name and explain 4 stages of AP
Resting: all channels closed
Depolarized : na channel open, k still closed
Repolararization: na closed, k open. Becomes polarized again
Hyper polarization : na closed k open
A rush of na ions would cause
Depolarization
What is graded potential
Inside cell more positive charge than outside
What happens when axon reaches axon terminal
Electrical change opens calcium gates. This causes vesicles to fuse with axonal membrane which causes neurotransmitter to be released