Action Potentials
Post Synaptic Potential
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100
This all or nothing response occurs when -65 mV is reached
What is an action potential
100
These molecules cause post synaptic potentials to interact with the presynaptic area of another neuron
What is a neurotransmitter?
100
Synapses at which the site of neurotransmitter rleesase and the site of neurotransmitter reception are in cloe proximity.
What is a directed synapse?
100
These receptors are associated with ligand-activated ion channels.
What are ionotropic receptors?
100
Between these the action potential signal is conduted passively, instantly and decrementally, along the first segment of myelin to the next one of these. Each time the signal is still strong enough to trigger an action potential
What is a node of Ranvier
200
This is the excitation threshold
What is -65 mV
200
These increase the liklihood that a neuron will fire.
What is an excitatory postsynaptic potential?
200
Synapses at which the site of release is at some distance from the site of reception.
What is a nondirected synapse?
200
These are located in different brain areas and typically respond to the neurotransmitter in different ways, allowing the same neurotransmitter to transmit different types of messages.
What are receptor subtypes?
200
This occurs when sodium channels close.
What is repolarization?
300
Adjacent to the axon hillock, this is where the action potential is generated
What is the axon initial segment
300
These decrease the likelihood that a neuron will fire.
What is an inhibitory postsynaptic potential?
300
These proteins are found within the lipid bilayer and actively maintain the negative charge within a cell.
What are sodium potassium pumps
300
This is the process of neurotransmitter release.
What is excocytosis?
300
This type of conduction occurs when electrical stimulation of sufficient intensity is applied to the terminal end of an axon, an action potential will be generated and will travel along the axon back to the cell body.
What is antidromic conduction?
400
This occurs when the cell's membrane potential switches from -70 to +50
What is rapid depolarization
400
These refer to both EPSPs and IPSPs in that both of their amplitudes are proportional to the intensity of the signals that elicit them.
What is a graded response?
400
This packages neurotransmitters into synaptic vesicles for release within the terminal buttons.
What is the golgi complex?
400
The entry of this ion through channels within the presynaptic membrane causes the fusion of presynaptic vesicles with the cell wall so that the contents may be released into the synaptic cleft
What are calcium ions?
400
Short amino acid chains that make up short proteins. All large neurotransmitters are of this type.
What are neuropeptides?
500
This is when a cell may not send another action potential.
What is the refractory period?
500
This occurs when EPSPs are produced simultaneously on different parts of the receptive membrane sum to form a greater EPSP.
What is spatial summation?
500
This is the rate at which synaptic vesicles move down microtubules to the synaptic buttons.
What is 40 cm per day?
500
The concept that neurons may contain two or more neurotransmitters.
What is coexistence?
500
This is axonal conduction in its natural direction from body to button.
What is orthodromic conduction?
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