PNB 2264 QUIZ 6 QUESTIONS WITH
CORRECT ANSWERS
Which of the following has two kinds of voltage-dependent gates? - Answer- voltage-
gated sodium (Na+) channels
A drug that has the same effect as one of our body's own neurotransmitters is called -
Answer- an agonist
Which of the following contributes to making a typical cell more negative on the inside
than the outside? - Answer- all of the above
In myelinated axons, - Answer- all of the above
An action potential refractory period occurs partly because - Answer- sodium (Na+)
channels are inactivate
At a chemical synapse, presynaptic exocytosis of neurotransmitter is caused by -
Answer- influx of Ca2+
Which of the following is typically more concentrated inside a cell? - Answer- potassium
(K+)
For a cell at a typical resting potential, which of the following types of ions typically
would have a net movement against its electrical gradient (assuming the membrane is
permeable to this ion)? - Answer- potassium (K+)
Gap junctions are required for - Answer- electrical synaptic transmission
A drug that prevents one of your nervous system's own neurotransmitters from
activating its postsynaptic receptors is called - Answer- an antagonist
A molecule that attaches to a particular kind of ion channel and prevents the ion
channel from opening is called - Answer- an antagonist
NASA's Spirit rover has just discovered life on Mars! In the alien organism's cells, the
voltage inside is always positive compared to the voltage outside the cells. The inside
and the outside of these cells both contain 1 M sodium ions (Na+). If the cell
membranes become permeable to Na+, the net flux of Na+
will be - Answer- out of the cell
, For a cell at a typical resting potential, which of the following types of ions typically
would have a net movement against its electrical gradient (assuming the membrane is
permeable to this ion)? - Answer- potassium (K+)
Which of the following happens first during an action potential? - Answer- voltage-gated
sodium (Na+) channels open
Immediately after an action potential, a neuron typically cannot generate another action
potential, due to - Answer- the inactivation of sodium (Na+) channels
The potassium (K+) channels involved in neuronal action potentials open in response to
- Answer- depolarization
A neuron's resting potential is typically nearest the equilibrium potential for - Answer-
potassium ions (K+)
As an action potential propagates along an axon from the axon hillock to the axon
terminals, the action potential - Answer- stays the same size
An artificial cell has a net positive charge due to impermeant cations (positively charged
ions) inside it. In addition, the fluid inside and just outside the cell contains 1 M NaCl.
The cell is initially impermeable to Na+ and Cl-. At a certain moment, it becomes
permeable to Na+. The Na+ will then have a net movement - Answer- out of the cell
As an action potential propagates along an axon from the axon hillock to the axon
terminals, the action potential - Answer- stays the same size
Action potentials are propagated fastest along axons that are - Answer- large-diameter
and myelinated
Which of the following happens latest at a chemical synapse involving a second
messenger (i.e., metabotropic) - Answer- ligand-gated ion channels open
Which of the following would typically increase the size of a postsynaptic potential at a
chemical synapse? - Answer- All of the Above
In chemical synaptic transmission involving a second messenger, the second
messenger - Answer- is in the cytosol of the postsynaptic cell
Action potentials typically are initiated - Answer- At the axon hillock
Which happens last during an action potential? - Answer- closing of potassium (K+)
channels
CORRECT ANSWERS
Which of the following has two kinds of voltage-dependent gates? - Answer- voltage-
gated sodium (Na+) channels
A drug that has the same effect as one of our body's own neurotransmitters is called -
Answer- an agonist
Which of the following contributes to making a typical cell more negative on the inside
than the outside? - Answer- all of the above
In myelinated axons, - Answer- all of the above
An action potential refractory period occurs partly because - Answer- sodium (Na+)
channels are inactivate
At a chemical synapse, presynaptic exocytosis of neurotransmitter is caused by -
Answer- influx of Ca2+
Which of the following is typically more concentrated inside a cell? - Answer- potassium
(K+)
For a cell at a typical resting potential, which of the following types of ions typically
would have a net movement against its electrical gradient (assuming the membrane is
permeable to this ion)? - Answer- potassium (K+)
Gap junctions are required for - Answer- electrical synaptic transmission
A drug that prevents one of your nervous system's own neurotransmitters from
activating its postsynaptic receptors is called - Answer- an antagonist
A molecule that attaches to a particular kind of ion channel and prevents the ion
channel from opening is called - Answer- an antagonist
NASA's Spirit rover has just discovered life on Mars! In the alien organism's cells, the
voltage inside is always positive compared to the voltage outside the cells. The inside
and the outside of these cells both contain 1 M sodium ions (Na+). If the cell
membranes become permeable to Na+, the net flux of Na+
will be - Answer- out of the cell
, For a cell at a typical resting potential, which of the following types of ions typically
would have a net movement against its electrical gradient (assuming the membrane is
permeable to this ion)? - Answer- potassium (K+)
Which of the following happens first during an action potential? - Answer- voltage-gated
sodium (Na+) channels open
Immediately after an action potential, a neuron typically cannot generate another action
potential, due to - Answer- the inactivation of sodium (Na+) channels
The potassium (K+) channels involved in neuronal action potentials open in response to
- Answer- depolarization
A neuron's resting potential is typically nearest the equilibrium potential for - Answer-
potassium ions (K+)
As an action potential propagates along an axon from the axon hillock to the axon
terminals, the action potential - Answer- stays the same size
An artificial cell has a net positive charge due to impermeant cations (positively charged
ions) inside it. In addition, the fluid inside and just outside the cell contains 1 M NaCl.
The cell is initially impermeable to Na+ and Cl-. At a certain moment, it becomes
permeable to Na+. The Na+ will then have a net movement - Answer- out of the cell
As an action potential propagates along an axon from the axon hillock to the axon
terminals, the action potential - Answer- stays the same size
Action potentials are propagated fastest along axons that are - Answer- large-diameter
and myelinated
Which of the following happens latest at a chemical synapse involving a second
messenger (i.e., metabotropic) - Answer- ligand-gated ion channels open
Which of the following would typically increase the size of a postsynaptic potential at a
chemical synapse? - Answer- All of the Above
In chemical synaptic transmission involving a second messenger, the second
messenger - Answer- is in the cytosol of the postsynaptic cell
Action potentials typically are initiated - Answer- At the axon hillock
Which happens last during an action potential? - Answer- closing of potassium (K+)
channels
