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19 terms

brain cellular structure

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basic unit of the brain
neuron
what does a neuron do
depolarizes or does not depolarize a charge
axon
the slender projection of a neuron
synapse
space between neurons
what causes the release of a neurotransmitter (chemical)
depolarization
dendrite
receiving part of a neuron
what happens when neurotransmitters enter the synapse
stimulate receptor sites at the dendrite
are there specific receptor sites for neurotransmitters
yes
what changes the rate of firing in a cell
response to neurotransmitters
what influences content of synapsis (so it influences receptors on dendrites)
1. rate of release 2. rate of breakdown in synapse 3. rate if re-uptake 4. responsiveness of receptors
t or f: receptor sites on dendrites can stimulate or inhibit the firing of the receiving cell
true
describe the organization of neurons
form into networks (circuits) with dynamically interact with other networks (circuits)
how many synapses
billions or trillions
inputs come from
5 senses and receptor nerves (including blood pressure and glucose)
outputs go to
glands and muscles (3 types smooth/involuntary, cardiac, skeletal)
receptor sites: 4 points to know
1. have a lock, key structure 2. can be hijacked by other substances 3. inhibited or potentiated by other substances 4. number and activity can change in response to neurotransmitters
how are networks/circuits strengthened or weakened
development of new axons and dendrites
in medication changes which is more powerful: change in network or change in neurotransmitters
a change in network structure
why psych meds have a slow rate of effect
takes time for the body to reorganize the structure/network