Neurophysiology (Exam 3)

Question 0

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

Answer 0

Identical

Do not

Question 1

As the AP travels down the length of the axon

Answer 1

It is newly generated at each patch of the membrane

Question 2

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

Answer 2

Complete

Is not

Question 3

Absolute refractory period

Answer 3

Cannot respond to further stimulation

No matter how strong

Question 4

During depolarization the membrane is in

Answer 4

An absolute refractory period

Question 5

Relative refractory period

Answer 5

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

Question 6

During repolarization the membrane is in

Answer 6

A relative refractory period

Question 7

Synapse

Answer 7

The junction where information is transferred from

Question 8

Neuro- neuronal synapse

Answer 8

One neuron to another neuron

Question 9

Neuro- muscular synapse

Answer 9

One neuron to a muscle

Question 10

Neuro-glandular synapse

Answer 10

One neuron to a gland

Question 11

Presynaptic cell

Answer 11

The neuron conducting signals toward the synapse

Info sender

Question 12

Postsynaptic cell

Answer 12

The receiving structure

Question 13

Functional types of synapses

Answer 13

Electrical

Chemical

Question 14

Gap junctions

Answer 14

Specialized cellular adhesions

Question 15

Electrical synapses

Answer 15

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

Ex. In the heart

Question 16

Chemical synapses

Answer 16

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

Question 17

Chemical synapse

Convert electrical to chemical

Answer 17

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

Question 18

The post synaptic structure can be……..

Answer 18

Excited or inhibited

Question 19

Excitatory post synaptic potential

Answer 19

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)

Question 20

Inhibitory post synaptic potential

Answer 20

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)