Neurophysiology 3 Flashcards
What type of conduction involves myelinated neurons?
Saltatory conduction
Which type of conduction is faster: unmyelinated or myelinated? Why?
Myelinated; The myelin insulation prevents communication therefore must JUMP between the nodes around the myelin contributing to a faster conduction
What type of conduction involved unmyelinated neurons?
continuous conduction
Continuous conduction
the action potential generated at each succeeding adjacent membrane segment
What do astrocytes do?
help with reuptake of NT back into the axon
What is the synaptic cleft?
the space between the axon and the receiving dendrite
Pre-synaptic events: What “awakens” the synthesizing enzyme in the axon and where does it come from?
Ca++ from outside the cell to inside the cell
What do the synthesizing enzyme produce?
Neurotransmitters
T/F Neurotransmitters are covered in little vesicles that line at the end of the axon.
TRUE
what is the end of the axon called?
Active Zone
Where are the receptors located?
Post-synaptic dendrite
What happens when NT binds to receptors?
allows NT or different specific ions to enter the dendrite (they become channels)
EPSP
Excitatory Post-Synaptic Potential; when + ions go into the dendrite- adds stimulus to possibly receive action potential
IPSP
Inhibitory Post-Synaptic Potential; when - ions go into the dendrite- decreases stimulus to inhibit action potential
Temporal Summation (EPSPs)
TIME- one dendrite with many potentials, and if you can add the potentials fast enough you may get a high enough voltage to reach the threshold
