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Lecture 5

PSYC 100 Lecture Notes - Lecture 5: Central Nervous System, Axon Terminal, Neuroglia


Department
Psychology
Course Code
PSYC 100
Professor
Jordan Poppenk
Lecture
5

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What Behaviour is Made Of
Neuroscience- scientific study of the nervous system
Nerve- a big conduit of brain cabling
Central nervous system- brain and spinal cord
Peripheral nervous system- peripheral nerves
- Skeletal and autonomic
- Skeletal- efferent (information travelling out) and afferent (information travelling from
distal locations throughout body)
- Autonomic- also has efferent and afferent components
o Efferent autonomic PNS is made of sympathetic and parasympathetic
o Sympathetic- “fight or flight” response- pupils expand, faster breathing, heart
pumps faster, gut inactive
o Parasympathetic- placid- pupils shrink, slower breathing and heart rate, gut is
active
Neuron
- Dendrites- branched extensions of a nerve cell that propagate the electrochemical
stimulation received from other neural cells to the cell body
- Axon-long, slender projection of a nerve cell that conducts electrical impulses
- Glial cell- surround neurons and provide support for and insulation between them
- Mylin sheath- fatty insulating later that surrounds the nerve cells
- Axon terminals- endings of the nerve cell by which axons make synaptic contacts with
other nerve cells
Action Potential
- Inhibitory synapses decrease the likelihood of the firing action potential of a cell while
excitatory synapses
increase its likelihood
- Depolarization-
sodium channels open
in response to a
stimulus
- Repolarization- sodium
channels close and
potassium channels
open
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