PNB 2274 Exam 2 Practice Questions And Answers With Latest Updates
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Course
PNB 2274
Institution
PNB 2274
PNB 2274 Exam 2 Practice Questions And Answers With Latest Updates
The region of the sarcomere containing only actin filament ANS I band
Reflexes are classified by each of the following EXCEPT: ANS by the response they generate
The mechanism of contraction in smooth muscle is different fro...
PNB 2274 Exam 2 Practice Questions And Answers
With Latest Updates
The region of the sarcomere containing only actin filament ANS I band
Reflexes are classified by each of the following EXCEPT: ANS by the response they generate
The mechanism of contraction in smooth muscle is different from skeletal muscle in that ANS
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? ANS 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 ANS Reflexes preserve
homeostasis
In a motor neuron, in which region of the cell would you expect to find the least number of voltage
gated sodium channels? ANS Synaptic Knob
Which of the following events are FALSE about the peak of the action potential when Vm is most
depolarized (~ +30mV)? ANS The inactivation gate of voltage gated sodium channels is OPEN
By increasing twitch frequency, muscles can generate: ANS 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 ANS The student measuring the potential outside the cell relative to
the inside
, The afferent (sensory) and efferent (motor) axons together form the ANS Peripheral nervous
system
During repolarization of the action potential (going from +30mV down to -80mV) ANS 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? ANS Less neurotransmitter would be released from a presynaptic
terminal in response to an action potential.
Stargazer mice have difficulty maintaining posture and moving normally. This defect has been
attributed to a defect in some potassium channels that allows Na+ as well as K+ to pass through the
channel. Increasing the sodium permeability will have what effect on the membrane potential of the
neuron? ANS The membrane potential will become less negative
The effect of a particular neurotransmitter is dependent upon the properties of the___, not the ___.
ANS Receptor, neurotransmitter
Which of the following is TRUE with regard to the relative refractory period? ANS It could
allow an action potential of much smaller amplitude to proceed along the length of an axon
Which of the following statements about the equilibrium potential for an ion are TRUE? ANS If
the concentration gradient of the ion changes, the equilibrium potential will also change.
Which of the following is an important function of ATP in muscle? (A) it is required for the
dissociation of myosin from actin. (B) it is hydrolyzed by the ATPase that pumps calcium ions into
the sarcoplasmic reticulum. (C) it is used for the phosphorylation of myosin in smooth muscle. (D) it
directly activates ryanodine receptors ANS Only A, B, and C is correct
The characteristic of muscles that allows them to return to their original resting shape after changing
size is known as: ANS Elasticity
Muscle tone is ANS A state of sustained partial contraction
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