The muscles of the eye need to make precise small motor movements. What size are the motor units in the eye?
The muscles of the thigh exhibit gross movements for walking. What size are the motor units in the thigh?
Random, asynchronous motor unit contractions provide a low-level tension and resistance to stretch called muscle __________.
What will happen to a muscle if the motor neuron is cut?
The synapse between a motor neuron and the muscle it innervates is called a:
What are the phases of a single muscle twitch (pick all that apply)
An increase in the strength of the stimulus will cause an increase in tension development caused by:
The development of tension in a muscle, in response to a single stimulus above threshold, is called a muscle ___________.
The shortest phase of a muscle twitch, usually lasting less than 5 milliseconds, is called the:
Sarcomeres lengthen during which phase/period of muscle twitch?
When a second stimulus is applied before complete relaxation, there is a greater development of tension. What is this called?
When a whole muscle is stimulated the force of the contraction is an all or nothing response with no variation in the amount of tension exerted. T or F.
During the initial phase of muscle contraction, each successive stimulus produces a slightly stronger contraction because of increased muscle warming and efficiency of enzymes. This stage is called:
With rapid, multiple stimulations, the contraction-relaxation cycles are shorter but there still is some degree of relaxation. This stage in the multiple stimuli graph is called:
With rapid, multiple stimulations, the contractions fuse into a smooth, continuous contraction. This stage in the multiple stimuli graph is called:
Once a muscle is completely Fatigued there is no recovery for that muscle—new muscle fibers must be generated. T or F.
Which Muscle will give the highest tension (force of contraction) when stimulated—all else being equal among the muscles?
For Treppe to be demonstrated by a muscle stimulated multiple times, the sequential stimulations must not happen until the muscle has completed the relaxation phase of the previous twitch. T or F.
Which is more likely to happen in the body?
Which of the following describes the relaxation phase?
What happened to the force of contraction when you changed the stimulation voltage from 3.0 to 5.0 volts?
In a 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 voltages would result in muscle tension in this muscle?
What is the threshold stimulus (voltage) in the muscle in the experiment?
At what stimulus voltage does the maximal contraction occur (in other words: what is the maximal stimulus)? If you increase the voltage at this point, will the force of contraction also increase?
Which of the following is occurring during the contraction phase of the muscle twitches?
What are the two conditions in the muscle that must be met in order to achieve treppe? (check the two answers)
Which of the following would result in complete or incomplete tetanus?
To transition from incomplete tetanus to complete tetanus, _______.
Which of the following describes how the duration of the rest period affected muscle tension (force of contraction)?
Which of the following describes how the duration of rest periods between multiple stimulations affects the duration the maximal force can be maintained by a muscle:
What phase of a single muscle twitch is indicated by the letter “A” in the graph below?
What phenomenon best describes the graph below?
What phase of a single muscle twitch is indicated by the letter “B” in the graph below?
What phenomenon best describes the graph below?
What phenomenon best describes part “A” of the graph below?
What phenomenon best describes part “D” of the graph below?
What phenomenon best describes part “C” of the graph below?
What is the maximum contraction for the muscle tested in the graph below?
The strongest muscle contractions are normally achieved by ________.
During what phase in the graph below are calcium ions actively transported back into the terminal cisternae?
What is changing to cause the variation in tension (force of contraction) seen in part B of the graph?
A smooth, sustained contraction is called ________.
What is a subthreshold stimulus for the muscle tested in the graph below?
Which of the following is not a way muscle contractions can be graded?
Which of the following is a way muscle contractions can be graded?
What is changing to cause the variation in tension (force of contraction) seen in the graph?
During what phase in the graph below do the Sarcolemma and T tubles depolarize?
By increas the stmltion voltge in the graph blw we are simulating the bodies control over the number of motor neurons that are stimulated by the central nervous system.
Build up of acidic compounds which affect protein functioning is happening in what part of the graph?
What phase of a single muscle twitch is indicated by the letter “C” in the graph below?
The speed of the _______ period of a sigle muscle twitch depends on whether slow or fast twitch fibers are involved.
What is being “added” to achieve wave summation?
During what phase in the graph below do the sarcomeres begin to shorten?
___________ is a decline in the muscle’s ability to maintain a constant force of contraction after prolonged repetitive stimulation.