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16 Cards in this Set

  • Front
  • Back
two basic types of synapses
electrical and chemical
Formed by connexons or gap junctions (bridges) between communicating cells.
electrical synapse
Functionally important in single unit smooth muscle cells and cardiac muscle cells - where they are called ______?
electrical synapse, intercalated discs
Bind to chemical-gated receptors on plasma membrane of other neurons, muscle cells, and glandular cells producing _______?
chemical synapses, post synaptic potential
______ are a type of graded potential and are not the same as an action potential. Can be either excitatory or inhibitory
PSP, post-synaptic potential
Are often (not exclusively) associated with the opening of chemically-gated Na+ channels.
EPSP, excitatory post-synaptic potential
two types of chemical synapses
Are often (not exclusively) associated with the opening of chemically gated K+ or Cl- channels.
IPSP, inhibitory post-synaptic potential
two types of summation:
spatial summation and temporal summation
Occurs when simultaneous stimuli from different pre-synaptic neurons have a cumulative effect on one post-synaptic cell
Spatial summation
This occurs when one pre-synaptic neuron fires repeatedly in rapid succession on one post-synaptic cell.
Temporal summation
Where are neurotransmitters synthesized:
either the cell bodies or synaptic end bulbs
If neurotransmitters are synthesized in cell bodies, where are they packaged?
They are packaged into secretory vesicles and moved down the axon (axon transport)
Where are neurotransmitters stored?
In secretory vesicles within synaptic end bulbs.
How are neurotransmitters released?
They are released as a result of electrical activity via exocytosis into synaptic clefts.
Neurotransmitters are removed from synaptic clefts via specific mechanisms: Name three
diffusion into surrounding fluids, enzymatic destruction, re-uptake