Exam (elaborations)
NPB 101L Lab Practical Practice Questions
- Course
- NPB 101L
- Institution
- University Of California - Davis
These are final questions for the lab practical. Some Answers are provided
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NPB 101L Practice Lab Practical1. We established a ________ relationship between ________ and _________when calibrating the transducer.
a. Logarithmic; voltage; force
b. Linear; force; tension
c. Linear; force; voltage
d. Logarithmic; voltage; amplitude
e. Two of the above are correct
f. None of the above are correct
2. In the frog muscle lab, we stimulated the ________ nerve. When this nerve was stimulated ________ fired
action potentials.
a. Sciatic; alpha motor neurons
b. Tibial; alpha motor neurons and sensory neurons
c. =Sciatic; alpha motor neurons and sensory neurons
d. Tibial; alpha motor neurons
e. Ulnar; gastrocnemius neurons
3. In the frog muscle lab, direct stimulation of the ____________ resulted in a ________ force generated. Indirect
stimulation of the _____________ resulted in a __________ generated.
a. Tibial nerve; larger; tibial nerve; smaller
b. Tibial nerve; smaller; tibial nerve; larger
c. Gastrocnemius muscle; larger; tibial nerve; smaller
d. Gastrocnemius muscle; smaller; gastrocnemius muscle; larger
e. Tibial nerve; larger; gastrocnemius muscle; smaller
f. Tibial nerve; smaller; gastrocnemius muscle; larger
4. Once acetylcholine binds to the nACh receptor the electrochemical gradient of the neuromuscular junction will
cause mainly ________ to flow into the cell which leads to ___________.
a. Potassium; more negative membrane potential
b. Potassium; more positive membrane potential.
c. Potassium and Sodium; more positive membrane potential
d. Sodium; no change in membrane potential, but an increase in Ca2+ current
e. Sodium; more positive membrane potential
f. Potassium and Sodium, no change in membrane potential, but an increase in Ca2+ current
g. None of the above
5. After the event described question 4, voltage gated sodium channels will respond to ______ and cause _______.
a. A more negative membrane potential; propagation of the action potential along the sarcolemma
b. A more positive membrane potential; propagation of calcium currents along the sarcoplasmic reticulum
c. A more positive membrane potential; propagation of the action potential along the sarcolemma
d. A electropositive ligand; propagation of action potentials and calcium currents along the sarcolemma
e. A more negative membrane potential; release of Ca2+ for RyR on the sarcoplasmic reticulum
6. How much longer does an action potential event last than the muscle contraction?
a. Approximately 100x
b. Approximately 10x
c. approximately 1000x
d. Actually the muscle contraction takes longer (about 100x)
e. Actually the muscle contraction takes longer (about 10x)
, 7. Increasing the stimulus frequency (constant voltage) in the skeletal muscle lab caused ________, which is known
as ____________.
a. Increased recruitment; spatial summation
b. Increased recruitment; temporal summation
c. Merging of individual contractions; spatial summation
d. Merging of individual contractions; temporal summation
e. None of the above are correct
f. Two of the above are correct
8. This principle describes the increasing recruitment of larger to smaller motor units in order to overcome a given
force.
a. Hoffman Principle
b. Henneman Size Principle
c. Temporal Summation
d. Reverse Hoffman Principle
e. None of the above
9. In the skeletal muscle lab, the following data was generated. What is the likely cause for the change in activity
seen after the arrow indicator? (Assume stimulus voltage and frequency are maintained)
a. nACh Receptor agonist added
b. nACh Receptor antagonist added
c. mACh Receptor agonist added
d. mACh Receptor antagonist added
10. What drug was used to inhibit muscle contraction in the skeletal muscle lab?
a. epinephrine
b. acetylcholine
c. tubocurare
d. norepinephrine
11. The H-Wave is initiated by:
a. Stimulation of 1a sensory afferents resulting in an orthodromic action potential.
b. Stimulation of alpha motor axons resulting in an orthodromic action potential.
c. Stimulation of 1a sensory afferents resulting in an antidromic action potential.
d. Stimulation of alpha motor axons resulting in an antidromic action potential
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