Neurophysiology (Exam 3) Flashcards
This flashcard deck was created using Flashcardlet's card creator
Each AP is _______, APs _______ decrease on intensity during propagation
Identical
Do not
As the AP travels down the length of the axon
It is newly generated at each patch of the membrane
Once threshold is reached a _______ AP is generated. It _______ possible to produce a partial AP
Complete
Is not
Absolute refractory period
Cannot respond to further stimulation
No matter how strong
During depolarization the membrane is in
An absolute refractory period
Relative refractory period
A 2nd AP can be generated on top of the first if the stimulus is strong enough
During repolarization the membrane is in
A relative refractory period
Synapse
The junction where information is transferred from
Neuro- neuronal synapse
One neuron to another neuron
Neuro- muscular synapse
One neuron to a muscle
Neuro-glandular synapse
One neuron to a gland
Presynaptic cell
The neuron conducting signals toward the synapse
Info sender
Postsynaptic cell
The receiving structure
Functional types of synapses
Electrical
Chemical
Gap junctions
Specialized cellular adhesions
Electrical synapses
Joined by gap junctions
Allow electricity to flow quickly from cell to cell
Ex. In the heart
Chemical synapses
Much more common
Specialized for the release and reception of neurotransmitters and neurohormones
Convert electrical signals into chemical signals
Chemical synapse
Convert electrical to chemical
The chemical signal travels across the synapse to the post synaptic structure
And then is converted back into electrical signals
The post synaptic structure can be……..
Excited or inhibited
Excitatory post synaptic potential
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)
Inhibitory post synaptic potential
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)
