anatomy physioX lab 2 – Flashcards
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question
which of the following occurs during the latent period of muscle contraction
answer
calcium is released from the sarcoplasmic reticulum
question
as the stimulus voltage was increased in this activity, which of the following occurred
answer
the muscle force generated increased
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which of the following describes the relaxation phase
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the sarcomeres are increasing in length, and the force generated decreases
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which of the following can trigger a muscle twitch
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release of acetylcholine or electrical stimulation
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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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increasing the applied voltage in the simulation corresponds to which in vivo event
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motor unit recruitment
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as the stimulus voltage increased, the resulting muscle tension
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increased to a point until it reached plateau
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which of the following occurs during the contraction phase
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cross bridge cycling is taking place
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which of the following produced an increase in stimulus intensity
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increasing the voltage applied
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which of the following produced an increase in stimulus frequency
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clicking the mouse in rapid succession
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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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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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to transition from unfused tetanus to fused tetanus
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stimulus frequency increased
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which of the following describes the relationship between stimulus frequency and muscle tension
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when stimulus frequency increases, muscle tension increases to a maximum value
question
at what stimulus frequency was maximal tetanic tension developed
answer
146 stimuli/sec
