PNB 2274 EXAM 2 PRACTICE
QUESTIONS AND ANSWERS
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 i...
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
Page 2/6
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller GraceAmelia. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.99. You're not tied to anything after your purchase.
