anatomy physioX lab 2 – Flashcards
15 test answers
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question
in the lab, a researcher finds that the threshold stimulus to induce an action potential in a muscle fiber's sarcolemma was 3.0 volts. which of the following would result in muscle tension
answer
3.0 and 4.0 volts
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question
increasing the applied voltage in the simulation corresponds to which in vivo event
answer
motor unit recruitment
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question
as the stimulus voltage increased, the resulting muscle tension
answer
increased to a point until it reached plateau
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question
which of the following occurs during the contraction phase
answer
cross bridge cycling is taking place
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question
which of the following produced an increase in stimulus intensity
answer
increasing the voltage applied
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question
which of the following produced an increase in stimulus frequency
answer
clicking the mouse in rapid succession
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question
describe treppe
answer
- a period of relaxation that can be seen on the muscle twitch tracing
- it is also referred to as the "staircase effect"
- an incremental increase in force occurs
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question
which of the following would result in fused or unfused tetanus compared to a single muscle twitch
answer
increasing the stimulus frequency
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question
to transition from unfused tetanus to fused tetanus
answer
stimulus frequency increased
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question
which of the following describes the relationship between stimulus frequency and muscle tension
answer
when stimulus frequency increases, muscle tension increases to a maximum value
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question
at what stimulus frequency was maximal tetanic tension developed
answer
146 stimuli/sec
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