PNB 2274 EXAM 2 PRACTICE
QUESTIONS AND ANSWERS 100%
PASS
The region of the sarcomere containing only actin filament - ✔✔I band
Reflexes are classified by each of the following EXCEPT: - ✔✔by the response they
generate
The mechanism of contraction in smooth muscle is different from skeletal muscle in that
- ✔✔Smooth muscles use calmodulin, whereas skeletal muscles uses troponin as
calcium sensors.
NS302 is a compound that promotes the binding of calcium from calmodulin. Based on
your knowledge on smooth muscle physiology, what will be the most likely effect if
you apply NS302 inside a smooth muscle? - ✔✔Smooth muscle relaxation will slow
down because calcium will stay bound longer to calmodulin further promoting MLCK
activation
Which of the following statements regarding reflexes is correct - ✔✔Reflexes preserve
homeostasis
Katelyn Whitman, All Rights Reserved © 2025 1
, In a motor neuron, in which region of the cell would you expect to find the least
number of voltage gated sodium channels? - ✔✔Synaptic Knob
Which of the following events are FALSE about the peak of the action potential when
Vm is most depolarized (~ +30mV)? - ✔✔The inactivation gate of voltage gated sodium
channels is OPEN
By increasing twitch frequency, muscles can generate: - ✔✔Greater tension, unfused
tetanus, & fused tetanus
While working in an electrophysiology laboratory, an undergraduate student measures
the resting membrane potential (Vm) of a mammalian cell to be +70mV rather than the
typical -70mV. The discrepancy is likely due to - ✔✔The student measuring the
potential outside the cell relative to the inside
The afferent (sensory) and efferent (motor) axons together form the - ✔✔Peripheral
nervous system
During repolarization of the action potential (going from +30mV down to -80mV) -
✔✔The equilibrium potential for K+ [EK] is approached
What would most likely happen if the concentration of calcium ions outside a
neuromuscular junction was decreased? - ✔✔Less neurotransmitter would be released
from a presynaptic terminal in response to an action potential.
Katelyn Whitman, All Rights Reserved © 2025 2
QUESTIONS AND ANSWERS 100%
PASS
The region of the sarcomere containing only actin filament - ✔✔I band
Reflexes are classified by each of the following EXCEPT: - ✔✔by the response they
generate
The mechanism of contraction in smooth muscle is different from skeletal muscle in that
- ✔✔Smooth muscles use calmodulin, whereas skeletal muscles uses troponin as
calcium sensors.
NS302 is a compound that promotes the binding of calcium from calmodulin. Based on
your knowledge on smooth muscle physiology, what will be the most likely effect if
you apply NS302 inside a smooth muscle? - ✔✔Smooth muscle relaxation will slow
down because calcium will stay bound longer to calmodulin further promoting MLCK
activation
Which of the following statements regarding reflexes is correct - ✔✔Reflexes preserve
homeostasis
Katelyn Whitman, All Rights Reserved © 2025 1
, In a motor neuron, in which region of the cell would you expect to find the least
number of voltage gated sodium channels? - ✔✔Synaptic Knob
Which of the following events are FALSE about the peak of the action potential when
Vm is most depolarized (~ +30mV)? - ✔✔The inactivation gate of voltage gated sodium
channels is OPEN
By increasing twitch frequency, muscles can generate: - ✔✔Greater tension, unfused
tetanus, & fused tetanus
While working in an electrophysiology laboratory, an undergraduate student measures
the resting membrane potential (Vm) of a mammalian cell to be +70mV rather than the
typical -70mV. The discrepancy is likely due to - ✔✔The student measuring the
potential outside the cell relative to the inside
The afferent (sensory) and efferent (motor) axons together form the - ✔✔Peripheral
nervous system
During repolarization of the action potential (going from +30mV down to -80mV) -
✔✔The equilibrium potential for K+ [EK] is approached
What would most likely happen if the concentration of calcium ions outside a
neuromuscular junction was decreased? - ✔✔Less neurotransmitter would be released
from a presynaptic terminal in response to an action potential.
Katelyn Whitman, All Rights Reserved © 2025 2
