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.
question
Which of the following describes the relaxation phase?
answer
The sarcomeres are increasing in length, and the force generated decreases.
question
Which of the following can trigger a muscle twitch?
answer
release of acetylcholine or electrical stimulation
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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 volts and 4.0 volts
question
Increasing the applied voltage in the simulation corresponds to which in vivo event?
answer
motor unit recruitment
question
As the stimulus voltage increased, the resulting muscle tension _______.
answer
increased to a point until it reached a plateau
question
Which of the following occurs during the contraction phase?
answer
Cross-bridge cycling is taking place.
question
Which of the following produced an increase in stimulus intensity?
answer
increasing the voltage applied
question
Which of the following produced an increase in stimulus frequency?
answer
clicking the mouse in rapid succession
question
Which of the following does NOT describe treppe?
answer
An increase in stimulus intensity is required to see the effect.
question
Which of the following would result in fused or unfused tetanus compared to a single muscle twitch?
answer
increasing the stimulus frequency
question
To transition from unfused tetanus to fused tetanus, _______.
answer
stimulus frequency increased
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.
question
At what stimulus frequency was maximal tetanic tension developed?
question
In this activity, why did the muscle force decrease over time?
answer
Muscle fatigue developed.
question
Which of the following describes how increasing the duration of the rest period affected muscle tension?
answer
Increasing the duration of the rest period increased the duration of the subsequent maximal tension.
question
What might be occurring on a molecular level during the rest periods?
answer
Intracellular ADP and inorganic phosphate are decreasing.
question
Which of the following describes the relationship between length and tension?
answer
The active force can increase or decrease, depending on the starting resting length of the muscle.
question
Why does the active force of skeletal muscle change with the muscle's resting length?
answer
The number of cross-bridges between actin and myosin varies.
question
Which starting length of the muscle provided the maximum total force?
answer
the longest starting length
question
At which muscle length was the passive force the greatest?
