T1 U3 Neurophysiology Flashcards

1
Q

The 4 basic electrical principles of the body are

A

Body electrically neutral
One type charge dominates
Opposites attract and this energy used to separate
Opposites together liberate energy

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2
Q

What is a neuron called when it is inactive

A

Polarized

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3
Q

Which ion is largely found outside the cell k+ or Na+

A

Na+

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4
Q

What is the difference between; voltage,

Potential, resistance, current

A

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

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5
Q

Formula for relation ship of charge is
V = r/I
R = v x I
I = v/r

A

C

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6
Q

What happens when gated ion channels open

A

Ions diffuse across the gradient

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7
Q

What is the electrical gradient

A

Movement to area of charge

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8
Q

How is the RMP stabilized

A

Sodium potassium pump

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9
Q

Membrane potential acts as…

A

An impulse ornsignal

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10
Q

Name the 2 MP signal types

A

Graded potential

Action potential

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11
Q

Where do action potentials take place

A

In the axon

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12
Q

Name and explain 4 stages of AP

A

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

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13
Q

A rush of na ions would cause

A

Depolarization

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14
Q

What is graded potential

A

Inside cell more positive charge than outside

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15
Q

What happens when axon reaches axon terminal

A

Electrical change opens calcium gates. This causes vesicles to fuse with axonal membrane which causes neurotransmitter to be released

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16
Q

What happens when a neurotransmitter is released by calcium

A

Neurotransmitter binds to receptor and causes na to enter which leads to graded potential

17
Q

Name the 5 synapses

A
Axodendritic 
Axosomatic 
Axoaxonic 
Dendrododenritic
Dendrosomatic
18
Q

Name 2 kinds of synapse

A

Electrical

Chemical

19
Q

The difference between presynaptic neuron and postsynaptic neuron

A

Presynaptic conduct towards synapse

Post conducts away from synapse

20
Q

Name 2 functional properties of nerves

A

Irritability

Conductivity