BIO 235 Final Exam Questions and Answers
100% Solved
An IPSP:
A. is caused by a chemically-gated sodium channel opening.
B. hyperpolarizes the post-synaptic cell pushing it farther from threshold.
C. is a graded depolarization of the post-synaptic cell.
D. is an excitatory stimulus bringing the neuron closer to an action potential. B.
hyperpolarizes the post-synaptic cell pushing it farther from threshold
Are the first channels opened when -55mV is reached at the axon hillock. Voltage-gated
sodium channels
Cause the transmembrane potential to maintain a relatively stable state of -70mV.
Cause a graded depolarization to occur on the cell body and dendrites.
,Cause the transmembrane potential to go from +30mV to about -90 mV.
Cause synaptic vesicles to migrate to the cell membrane at the synaptic terminal. calcium
produce myelination in the peripheral nervous system (PNS) neurons.
A. Schwann cells
B. Satellite cells
C. Astrocytes Ependymal cells
D. Oligodendrocytes
E. Microglia Schwann Cells
What causes chemically-gated channels to open?
A. The binding of calcium ion to the channel.
B. The binding of neurotransmitter to the channel.
C. The binding of potassium ion to the channel.
D. The binding of a sodium ion to the channel. B. binding of a neurotransmitter
, Because all action potentials are alike, how does a neuron communicate to the next neuron if the
original stimulus was intense or just a neusance?
Describe what is happening in the neuron during a graded potential. Please only describe what is
happening at the location where the graded potential occurs, but be sure to include all relevant
chemicals and parts of the cell involved is produced when a ligand opens a ligand-gated
channel in the dendrites, allowing ions to enter (or exit) the cell. The graded potential will
degrade with distance, so it would decrement before reaching the end of the axon if an action
potential were not generated.
In what way does the interior voltage of an axon (during resting membrane potential) compared
to outside of the same axons voltage? The interior is
______________________________________.
a. Negatively charged and contains less sodium
b. Negatively charged and contains more sodium
c. Positively charged and contains less sodium
d. Positively charged and more sodium A. negative; less sodium
100% Solved
An IPSP:
A. is caused by a chemically-gated sodium channel opening.
B. hyperpolarizes the post-synaptic cell pushing it farther from threshold.
C. is a graded depolarization of the post-synaptic cell.
D. is an excitatory stimulus bringing the neuron closer to an action potential. B.
hyperpolarizes the post-synaptic cell pushing it farther from threshold
Are the first channels opened when -55mV is reached at the axon hillock. Voltage-gated
sodium channels
Cause the transmembrane potential to maintain a relatively stable state of -70mV.
Cause a graded depolarization to occur on the cell body and dendrites.
,Cause the transmembrane potential to go from +30mV to about -90 mV.
Cause synaptic vesicles to migrate to the cell membrane at the synaptic terminal. calcium
produce myelination in the peripheral nervous system (PNS) neurons.
A. Schwann cells
B. Satellite cells
C. Astrocytes Ependymal cells
D. Oligodendrocytes
E. Microglia Schwann Cells
What causes chemically-gated channels to open?
A. The binding of calcium ion to the channel.
B. The binding of neurotransmitter to the channel.
C. The binding of potassium ion to the channel.
D. The binding of a sodium ion to the channel. B. binding of a neurotransmitter
, Because all action potentials are alike, how does a neuron communicate to the next neuron if the
original stimulus was intense or just a neusance?
Describe what is happening in the neuron during a graded potential. Please only describe what is
happening at the location where the graded potential occurs, but be sure to include all relevant
chemicals and parts of the cell involved is produced when a ligand opens a ligand-gated
channel in the dendrites, allowing ions to enter (or exit) the cell. The graded potential will
degrade with distance, so it would decrement before reaching the end of the axon if an action
potential were not generated.
In what way does the interior voltage of an axon (during resting membrane potential) compared
to outside of the same axons voltage? The interior is
______________________________________.
a. Negatively charged and contains less sodium
b. Negatively charged and contains more sodium
c. Positively charged and contains less sodium
d. Positively charged and more sodium A. negative; less sodium
