Neurophysiology (Exam 3) Flashcards Preview

Spring of 2012 > Neurophysiology (Exam 3) > Flashcards

Flashcards in Neurophysiology (Exam 3) Deck (21)
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0
Q

Each AP is _______, APs _______ decrease on intensity during propagation

A

Identical

Do not

1
Q

As the AP travels down the length of the axon

A

It is newly generated at each patch of the membrane

2
Q

Once threshold is reached a _______ AP is generated. It _______ possible to produce a partial AP

A

Complete

Is not

3
Q

Absolute refractory period

A

Cannot respond to further stimulation

No matter how strong

4
Q

During depolarization the membrane is in

A

An absolute refractory period

5
Q

Relative refractory period

A

A 2nd AP can be generated on top of the first if the stimulus is strong enough

6
Q

During repolarization the membrane is in

A

A relative refractory period

7
Q

Synapse

A

The junction where information is transferred from

8
Q

Neuro- neuronal synapse

A

One neuron to another neuron

9
Q

Neuro- muscular synapse

A

One neuron to a muscle

10
Q

Neuro-glandular synapse

A

One neuron to a gland

11
Q

Presynaptic cell

A

The neuron conducting signals toward the synapse

Info sender

12
Q

Postsynaptic cell

A

The receiving structure

13
Q

Functional types of synapses

A

Electrical

Chemical

14
Q

Gap junctions

A

Specialized cellular adhesions

15
Q

Electrical synapses

A

Joined by gap junctions
Allow electricity to flow quickly from cell to cell

Ex. In the heart

16
Q

Chemical synapses

A

Much more common
Specialized for the release and reception of neurotransmitters and neurohormones
Convert electrical signals into chemical signals

17
Q

Chemical synapse

Convert electrical to chemical

A

The chemical signal travels across the synapse to the post synaptic structure
And then is converted back into electrical signals

18
Q

The post synaptic structure can be……..

A

Excited or inhibited

19
Q

Excitatory post synaptic potential

A

NT/NH binding causes channels that allow depolarization to open
Becomes more positive on the inside
Brought closer to threshold
Usually chemically gated Na+ ion channels (influx)

20
Q

Inhibitory post synaptic potential

A

NT/NH binding causes channels that induce hyperpolarization to open
Becomes more negative on he inside
Taken further from threshold
Can be chemically gated K+ ion channels (eflux) or chemically gated Cl- ion channels (influx)

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