Nervous system and cells
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Nervous system and cells
neurons and stuff chapter 3
purpose is structural support, nourishment and insulation
what does the glia help to do?
maintain chemical environment in neuron
receive, integrate, and transmit info
cell body that contains chemical components
True or false? no two neurons ever touch
transmits info away from soma to other neurons
axon is wrapped in?
glial cells that insulate and speeds transmission of signals
located at the end of the axon
release neurotransmitters that transmit messages to neighboring neurons
the space where messages are passed from 1 neuron to another
stable, negative charge when the cell is inactive?
how many millivolts in resting potential?
change in voltage allows message to be transmitted?
the neural impulse is an ?
all or none law
where does transmission take place?
a gap between the terminal button of one neuron and the cell membrane of another neuron
neuron that send a signal across the gap
received the signal
where chemicals are stored in small sacs
PSP's do not follow?
the all or none law
2 types of messages sent from cell to cell?
a positive voltage shift that increases the likelihood that the postsynaptic neuron will fire action potentials
negative voltage shift that describes the likelihood that the PS neuron will fire action potentials
process in which neurotransmitters are reabsorbed
what works like a lock and key?
*only certain ones can bind with the other
a neuron receives stimulation on the parts known as?
when the neuron is stimulated, channels in the membrane ____ and ___ ___ ___ ___ flush into the cell
postiviely charged sodium ions
when the ions enter the neuron, the charge of the neuron changes from its ____ potential of ____ millivolts to a _____ ___
the change in voltage causes an ____ ____ to be created
the impulse travels down the ____ toward the ____ ____
when the action potential reaches the teminal buttons, the ____ ____ fuse with the membrance and ________ spill into the _____ ____
The neurotransmitters bind to _____ ____ on the receiving neuron.
the sites work like a ____ and ____
lock and key
this creates a _____ _____ in the receiving neuron which can either be _____ or ____
after the neurotransmitters bind with the receptor sites, the excess neurotransmitters will be reabsorbed into the terminal buttons through a process called?
the chemical messengers of the nervous system are?
contributes to alzheimers
ACh is the only neurotransmitter between ___ ___ and ____ ___
chemical that mimics the action of a neurotransmitter
example of a agonist?
a chemical that opposes that action of a neurotransmitter
what do antagonists fail to cause?
what do antagonists block?
the action of the natural neurotransmitter
example of an ACh antagonist?
How does curare work?
It blocks action at the ACh synapses, and causes muscles to be unable to move
blocks reabsorbtion of serotonin in people with depression to elevate mood
dopamine helps control?
degeneration of dopamine releasing neurons can cause?
serotonin helps regulate?
aggressive behavior in animals
agression and impulsive behavior in humans
what does NE and serotonin contribute to?
schizophrenia is influence by what neurotransmitter?
GABA and glycine only?
produce inhibitory PSP's
central nervous system
internally produced morphinelike substance
feel good hormone
what triggers the production of oxytocin?
when your not accessins a pathway enough/