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WHS: Neuron 2
synapse, neurotransmitters
32
Physiology
12th Grade
01/04/2011

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Term
Presynaptic Neuron
Definition
Neuron That brings impulse to synapsis
Term
Synaptic Vessicle
Definition
Stores nuerotransmitter in synaptic knobs
Term
Saltatory Conduction
Definition
When impulses jump from node to node on myelinated axons, speeding up the transmission
Term
Calcium, Ca+
Definition
What ion is required to close Na+ channels?
Term
Anesthetics
Ex. Procaine, Novacaine
Definition
These decrease membrane premeability to Na+ on touch and pain neurons
Term
Thick and Myelinated
Definition
Which nerves are the fastest?
Term
Inhibitory Neurotrannsmitters
Definition
Neurotransmitters that increase permeability to K+ outside neuron
Term
Excitatory Neurotransmitters
Definition
Meurotransmitters that bind to receptors that open NA+ channels
Term
Trigger Zone
Definition
The initial part of the axon where summation of all the stimuli is "summed up" together to determine if threshold is reached.
Term
1. Action potential along axon causes axon to be more permeable to Ca+ and Ca rushes into axon. 2. Ca+ causes synaptic vessicles to migrate to end of knob 3. Vessicles dump neurotransmitter into the cleft.
Definition
What are the steps leading to neurotransmitter release?
Term
Enzymes destroy neurotransmitter or reuptake of neurotransmitters into vessicles
Definition
How is the neurotransmitter's effect on the postsynaptic membrane stopped?
Term
Reuptake
Definition
When neurotransmitters are removed from the synamptic cleft and put back in
Term
Enkephelins, Endorphins
Definition
Name two natural pain killers made by the body.
Term
Acetylcholine, Epinephrine, glutamate, Histamine
Definition
Name 3 excitatory neurotransmitters
Term
Dopamine, GABA, Serotonin
Definition
Name 3 inhibitory neurotransmitters
Term
Acetylcholine
Definition
What's the neurotransmitter that excites skeletal muscles?
Term
Parkinson's
Definition
What disease is caused by a dopamine deficiency?
Term
1. block binding site for neurotransmitter
2. block reuptake of neuro.
3. block synthesis or release of neurotrans.
Definition
List several ways that conduction across a synapse can be interrupted
Term
The inside is negatively charge compared to the outside. The charge difference is -70 mv
Definition
Describe a resting neuron.
Term
Na+ otuside cell membrane; K+ and Cl- are inside cell membrane
Definition
Where are Na+, K+ and Cl- ions in most numerous in the neuron?
Term
Threshold potential
Definition
What's the minimum stimulus needed to reach an action potential?
Term
Neurons are excitable. That means the dendrites become more permeable to Na+
Definition
How is threshold reached?
Term
Na+/ K+ pump
Definition
What maintains a polarized membrane at a resting neuron?
Term
Hyperpolarized
Ex. -90 mv
Definition
What is a membrane called that is more negative than the resting potential?
Term
An action potential begins
Definition
What happens when threshold is reached?
Term
Depolarization and Repolarization
Definition
What are the two events in an action potential?
Term
Na+ rushing into the cell membrane
Definition
What depolarizes the neuron?
Term
K+ rushing out of the cell membrane
Definition
What repolarizes the cell membrane?
Term
Impulse
Definition
What is a wave of action potential called?
Term
If threshold is reached an impulse will travel down the entire axon and all impulses are of the same strength.
Definition
What is the all or none response?
Term
Refractory Period
Definition
the brief time after a nerve impulse where another impulse won't be able to start.
Term
More.
Definition
A greater intensity stimulus produces _____ impulses/ second
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