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Transcript of The Synapse
By: Haley, Rebekkah, Megan, Leann, and Zach
Neurotransmission occurs between the axon terminal of one neuron and the dendrite of another.
At the synapse, information transmitted from one neuron to another via chemical messengers
An action potential is an electrical signal.
Chemical messengers, or neurotransmitters, are needed to get information across the synapse because chemical messengers can cross the fluid-filled synaptic cleft.
Ions: charged particles that change the electrical properties of the membrane
Ions are important for neurotransmission because without them, it would be impossible for a neuron to generate an action potential.
The 4 most common ions are Potassium (K), Sodium (NA), Calcium (Ca), and Chlorine (cl).
Ions get across the neuron membrane through ion channels or gap junctions.
An ion channel will only open when a specific neurotransmitter binds to its receptor site.
if enough ions flow into the post synaptic neuron, the neuron's threshold will be reached and the neuron will fire an action potential.
Vesicles store neurotransmitters.
what effect does an action potential have on a vesicle?
to migrate to the membrane
bind to it
then it releases its neurotransmitter contents
Once a neurotransmitter has done it's job, then it re-enters the cell to be recycled.
A mitochondria produces energy that drives the production of the neurotransmitter, the creation of vesicles, and the transport process with the axon.
5 steps that takes place in transmittion information across a synapse
an action potential arrives at the axon terminal
triggers release of neurotransmitter from a vesical
neurotransmitter binds to receptor sites on ion channels
ions cross the membrane through open channels
influx of ions produces a synaptic potential in the postsynaptic neuron