Please enable JavaScript.
Coggle requires JavaScript to display documents.
action potential and synapses (types of synapses (axosomatic synapse: axon…
action potential and synapses
types of synapses
axosomatic synapse:
axon to soma (
stimulatory or inhibitory
)
axodendritic synapse:
axon to dendrite (
stimulatory or inhibitory
)
axoaxonic synapse:
axon to axon (
regulatory
)
neurotransmitter receptors
inhibitory synapses
hyperpolarization
opening up Cl- or K+ channels on post-synaptic cell
net results
activity of post synaptic neurons is determined by the summation of activity at hundreds of synapses on that cell
excitatory synapses
opening up Na+ or Ca++ channel on post-synaptic cell
depolarization
the degradation of neurotransmitters is just as important as the arrival of them
classes of gated channels
chemically gated:
open in presence of specific chemicals (e.g. ACh) at binding site,
found on neuron somas and dendrites
voltage-gated
: respond to changes in transmembrane potential,
found in neural axonlemma, skeletal and cardiac muscle
mechanically gated:
respond to membrane distortion
potentials
graded potential:
chemically gated, dose-dependent, diminishes with distance
action potential:
voltage-gated, all-or-none, maintains strength, refractory period