Bio E109- Module 2 Questions With Complete Solutions
2nd messenger system Correct Answers pathways that can alter
state of cells, including long-term resting membrane potential,
can affect density of channels and their open/close state
axon hillock Correct Answers spike initiating zone, at the axon
base, site of action potential start, if depolarization triggers
voltage gated in the axon, then it will cause action potential
do electromotive force and chemical diffusion act in the
opposite direction? Correct Answers yes
does the K+ voltage gated channel have an inactivation gate?
Correct Answers no
excitatory synapse Correct Answers depolarization by ligand-
gated channel that increases permeability of Na+, no action
potential on dendrite because no voltage-gated channels, graded
potentials
G-protein coupled receptor Correct Answers slight
hyperpolarization and also slightly depolarization
graded potentials Correct Answers depolarization below action
potential level, decrease with distance, dendrites work with these
how does insulating the axon help transmit signals quickly?
Correct Answers insulating the axon keeps Na+ inside and
speeds action potential propagation
, how does permeability change? Correct Answers changes by
the activity of gated ion-channels
how does the goldman equation show membrane potential?
Correct Answers permeability dictates how close the membrane
potential is to the equilibrium potential of an ion, comprehension
of membrane potential at a given time.
how does the nernst equation show membrane potential?
Correct Answers concentration difference and charge of an ion
determine equilibrium potential, determines how influential an
ion can be
inhibitory synapse Correct Answers hyperpolarization by
ligand-gated channel that increases permeability of Cl-
myelin Correct Answers provides electrical insulation for the
axon
node of ranvier Correct Answers packed with voltage-gated
channels, nodes leap frog to avoid graded potentials
schwann cell Correct Answers provide myelinated axon, wrap
around axon, no voltage-gated channel, efficient propagation of
depolarization within cell
spatial summation Correct Answers multiple presynaptic cells
affect membrane potential at axon hillock, summation to create a
greater depolarization to thus create AP
2nd messenger system Correct Answers pathways that can alter
state of cells, including long-term resting membrane potential,
can affect density of channels and their open/close state
axon hillock Correct Answers spike initiating zone, at the axon
base, site of action potential start, if depolarization triggers
voltage gated in the axon, then it will cause action potential
do electromotive force and chemical diffusion act in the
opposite direction? Correct Answers yes
does the K+ voltage gated channel have an inactivation gate?
Correct Answers no
excitatory synapse Correct Answers depolarization by ligand-
gated channel that increases permeability of Na+, no action
potential on dendrite because no voltage-gated channels, graded
potentials
G-protein coupled receptor Correct Answers slight
hyperpolarization and also slightly depolarization
graded potentials Correct Answers depolarization below action
potential level, decrease with distance, dendrites work with these
how does insulating the axon help transmit signals quickly?
Correct Answers insulating the axon keeps Na+ inside and
speeds action potential propagation
, how does permeability change? Correct Answers changes by
the activity of gated ion-channels
how does the goldman equation show membrane potential?
Correct Answers permeability dictates how close the membrane
potential is to the equilibrium potential of an ion, comprehension
of membrane potential at a given time.
how does the nernst equation show membrane potential?
Correct Answers concentration difference and charge of an ion
determine equilibrium potential, determines how influential an
ion can be
inhibitory synapse Correct Answers hyperpolarization by
ligand-gated channel that increases permeability of Cl-
myelin Correct Answers provides electrical insulation for the
axon
node of ranvier Correct Answers packed with voltage-gated
channels, nodes leap frog to avoid graded potentials
schwann cell Correct Answers provide myelinated axon, wrap
around axon, no voltage-gated channel, efficient propagation of
depolarization within cell
spatial summation Correct Answers multiple presynaptic cells
affect membrane potential at axon hillock, summation to create a
greater depolarization to thus create AP
