A condition in which stimuli occur so rapidly that there are no intervening relaxations between contractions is called
A. complete tetanus.
B. incomplete tetanus.
C. involuntary paralysis.
D. all or none tetanus.
E. treppe.
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Question 2) Which of the following helps explain the increased tension seen in multiple wave summation?
A. increased motor unit recruitment
B. increased concentration of calcium ions around the myofibrils
C. exposure of more active sites on myosin myofilaments
D. the breakdown of elastic elements in the cell
E. decreased stimulus frequency
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Question 3) Treppe
A. can contribute to improved muscle efficiency.
B. may be due to an increase in the level of calcium ions around the myofibril.
C. is an example of a graded response.
D. is achieved during warm-up exercises.
E. All of these choices are correct.
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Question 4) The stretch of elastic components of a muscle adds to the increased tension during
A. incomplete tetanus.
B. twitch.
C. multiple wave summation.
D. all or none response.
E. none of these.
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Question 5) Which of the following will respond to a threshold stimulus with an all-or-none contraction?
A. a single muscle fiber
B. a single motor unit
C. a whole muscle
D. a single muscle fiber and a single motor unit
E. a single muscle fiber, a single motor unit, and a whole muscle
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Question 6) Whole muscles can respond in a graded fashion to stimuli by varying
A. the force of contraction of individual muscle fibers.
B. the number of motor units recruited.
C. the amplitude of the action potential.
D. the frequency of stimulus.
E. thresholds.
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Question 7) Tetanus of a muscle is thought to be caused by
A. high calcium ion concentrations in the sarcoplasm.
B. the rapid movement of sodium ions back into the sarcoplasmic reticulum.
C. an increase in stimulus strength.
D. increased temperature in the active muscle.
E. decreased amounts of calcium ions in muscle tissue.
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Question 8) Which of the following would occur as a result of a single muscle contraction?
A. tetanus
B. tone
C. treppe
D. twitch
E. paralysis
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Question 9) A sustained muscle contraction is known as
A. tetanus
B. tone
C. treppe
D. twitch
E. paralysis
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Question 10) After contraction has occurred, the calcium is
A. destroyed by cholinesterase.
B. chemically bound to the cross bridges.
C. secreted by the Golgi apparatus to the outside of the cell.
D. released from troponin.
E. returned to the sarcolemma.
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