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BIO 348 MIDTERM 1 Questions with Correct Answers.
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BIO 348 MIDTERM 1 Questions with Correct Answers.
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BIO 348 MIDTERM 1 Questions with CorrectAnswers
ion specific currents Correct Answer-permeability + driving force
ohm's law Correct Answer-V=IR
inverse ohm's law Correct Answer-I=gV ; permeability and conductance
are the same in this context
high permeability Correct Answer-low driving force
the resting membrane potential depends on Correct Answer-permeability
to K+, electrochemical gradients, and the Na/K pump
physical properties that impact neuron response to a current Correct
Answer-membrane resistance, internal resistance, and capacitance
membrane resistance Correct Answer-dictated by number of leak
channels; more leak channels = less resistance
internal resistence Correct Answer-determined by axon diameter and
cytoplasm; larger Ri means there is greater opportunity for current to
leave the cell
, capacitance Correct Answer-separation and surface area; closer the
charges, greater capacity to store them
do ion channels impact capacitance? Correct Answer-nope
do dendrites have ion channels? Correct Answer-nope
temporal summation Correct Answer-synaptic inputs in time can build
on another; input a + a
spatial summation Correct Answer-synaptic inputs from two neurons
can integrate over an area; input a + b
time constant Correct Answer-time for Vm to change by 63%; T=RmC
length constant Correct Answer-length it takes to change Vm by 63%;
square root (Rm/Ri)
axon hillock Correct Answer-where graded potentials encounter voltage
gated channels
Na+ channels Correct Answer-inactivated until Vm is back below
threshold
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