CBNS 120 MIDTERM 1 QUESTIONS WITH VERIFIED
ANSWERS
The sodium-potassium pump is involved in establishing the resting membrane potential.
a- True
b- False - Answers - true
After a neuron has generated an action potential, it cannot generate another one for a
while. This period is called:
the absolute refractory period.
the relative refractory period.
hyperpolarization. - Answers - absolute refractory period
At resting membrane potential, which of the following statements about the voltage-
gated sodium ion (Na+) channels is TRUE?
a- activation gates are closed and inactivation gates are open
b- activation gates are open and inactivation gates are closed
c- activation and inactivation gates are open
d- activation and inactivation gates are closed
e- activation and inactivation gates alternate between open and closed - Answers - a-
activation gates are closed and inactivation gates are open
What would the units be for the product from the Nernst equation?
a- mV-millivolts
b- A-Amps
c- C-Coulombs
d- Ion/Sec - Answers - a- mV-millivolts
, Using the Nernst equation calculate the Ek+ if the intracellular concentration is 410
mmol/l and the extracellular is 22mmol/l assuming that the temperature is 20oC. What is
your answer?
a- +69
b- -79
c- -74
d- +54 - Answers - c- -74
Oligodendrocytes and Schwann cells differ in what way
a) Oligodendrocytes are found in the central nervous system, whereas Schwann cells
are found
in the peripheral nervous system.
b) Oligodendrocytes are myelinating glia, whereas Schwann cells are microglia
c) One oligodendrocyte will surround one axon, whereas each Schwann cell affiliates
with
several axons.
d) Oligodendrocytes form nodes of Ranvier, while Schwann cells do not - Answers - a)
Oligodendrocytes are found in the central nervous system, whereas Schwann cells are
found
in the peripheral nervous system.
the neuron doctrine states that
a) Neurites are fused together to form a continuous network
b) Neurites are not continuous and communicate by contact
c) Neurons must contain a soma, an axon, and dendrites
d) DNA is transcribed to mRNA which is translated into protein - Answers - c) Neurons
must contain a soma, an axon, and dendrites
Which of the following values is unnecessary when finding the equilibrium potential of
an ion
a) The temperature
b) The ratio of external and internal ion concentrations
c) The charge of the ion
d) The permeability of the ion channel - Answers - d) The permeability of the ion
channel
The resting membrane potential is close in value to the Nernst equilibrium potential for
____ because _______
a) Na+ / there is a leakage of Na+ ions through the membrane channels
ANSWERS
The sodium-potassium pump is involved in establishing the resting membrane potential.
a- True
b- False - Answers - true
After a neuron has generated an action potential, it cannot generate another one for a
while. This period is called:
the absolute refractory period.
the relative refractory period.
hyperpolarization. - Answers - absolute refractory period
At resting membrane potential, which of the following statements about the voltage-
gated sodium ion (Na+) channels is TRUE?
a- activation gates are closed and inactivation gates are open
b- activation gates are open and inactivation gates are closed
c- activation and inactivation gates are open
d- activation and inactivation gates are closed
e- activation and inactivation gates alternate between open and closed - Answers - a-
activation gates are closed and inactivation gates are open
What would the units be for the product from the Nernst equation?
a- mV-millivolts
b- A-Amps
c- C-Coulombs
d- Ion/Sec - Answers - a- mV-millivolts
, Using the Nernst equation calculate the Ek+ if the intracellular concentration is 410
mmol/l and the extracellular is 22mmol/l assuming that the temperature is 20oC. What is
your answer?
a- +69
b- -79
c- -74
d- +54 - Answers - c- -74
Oligodendrocytes and Schwann cells differ in what way
a) Oligodendrocytes are found in the central nervous system, whereas Schwann cells
are found
in the peripheral nervous system.
b) Oligodendrocytes are myelinating glia, whereas Schwann cells are microglia
c) One oligodendrocyte will surround one axon, whereas each Schwann cell affiliates
with
several axons.
d) Oligodendrocytes form nodes of Ranvier, while Schwann cells do not - Answers - a)
Oligodendrocytes are found in the central nervous system, whereas Schwann cells are
found
in the peripheral nervous system.
the neuron doctrine states that
a) Neurites are fused together to form a continuous network
b) Neurites are not continuous and communicate by contact
c) Neurons must contain a soma, an axon, and dendrites
d) DNA is transcribed to mRNA which is translated into protein - Answers - c) Neurons
must contain a soma, an axon, and dendrites
Which of the following values is unnecessary when finding the equilibrium potential of
an ion
a) The temperature
b) The ratio of external and internal ion concentrations
c) The charge of the ion
d) The permeability of the ion channel - Answers - d) The permeability of the ion
channel
The resting membrane potential is close in value to the Nernst equilibrium potential for
____ because _______
a) Na+ / there is a leakage of Na+ ions through the membrane channels
