Animal Nervous System Flashcards
week 7 (22 cards)
what does the dendrites of the neuron do?
receives information from other neuron cells
what does the axon of the neuron do?
conducts electrical impulses aways from the cell body
what does the axon initial segments of the neuron do?
the start of where action potential occurs
what does the axon hillock of the neuron do?
the trigger zone of the axon potential
what does the axon terminal of the neuron do?
transmits electrical and chemical signals to other neuron
what does the soma of the neuron do?
where information is combined or meet
which region or
regions can fire action potentials and which ones cannot? Why/why not?
The axon, axon hillock, and axon terminals can fire action potentials
gated ions channels (membrane proteins) enable ions to move across the membrane for depolarization and repolarization
does action potential occur in the myelin sheath?
no, its thick which is hard to leak ions
how does concentration gradients move Na+ and P+ passively across neuron cell membranes?
Na+ move inward to lower [Na+]
K+ move outward to lower [K+]
how does electrical gradients move Na+ and P+ passively across neuron cell membranes?
since both Na and K are positive ions, they move inward to the negative charge side
how does electrochemical gradients move Na+ and P+ passively across neuron cell membranes?
Na+ moves inward through small leaks around the membrane
K+ moves outward through slow leaks throughout the membrane
what voltage is resting membrane potential at?
-70 mv
graded potential is able to do what?
depolarization and hyperpolatization
what are liganad channels?
open when binded to a neurotransmitter allowing positive ions (cations) to move in the postsynapic neuron
during (depolarization) or (hyperpolarization)
what are voltaged channels?
protein channels that open/close depending on the voltage on the membrane
when do voltage channels close?
they are closed during resting potential at -70 mv
when do voltage channels open?
depending on the voltage and the channel
what is depolarization
increase positive ions (increase of Na+)
making cell more positive
recap of resting membrane potential
ATPase, leaking channels,
what gets resting membrane potential to threshold potential?
e.p.s.p = depolarization= increasing + ions
what is repolarization?
getting voltage back to rmp (-70)
what is hyperpolarization?
making a cell more negative
increasing - ions
