During the time when the action potential moves through the sarcolemma a muscle twitch is in
A) contraction phase.
B) relaxation phase.
C) stimulus phase.
D) latent period.
E) isotonic period.
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Question 2) A muscle produces its highest tension when in complete
A) recovery.
B) treppe.
C) wave summation.
D) aerobic metabolism.
E) tetanus.
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Question 3) A single contraction-relaxation cycle in a muscle fiber produces a(n)
A) cramp.
B) twitch.
C) tetanic contraction.
D) action potential.
E) motor unit.
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Question 4) What is the contraction in graph (d) called?
A) complete tetanus
B) incomplete tetanus
C) twitch
D) wave summation
E) treppe
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Question 5) Why is there partial relaxation in graph (c)?
A) Calcium ion release is slow.
B) The muscle is starting to fatigue.
C) Stimulation intensity is fluctuating.
D) ATP reserves are cycling.
E) Nerve stimulation frequency is below maximum.
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Question 6) To produce a contraction similar to the one in graph (b), the muscle
A) must be stimulated to the point of fatigue.
B) must be stimulated again before it has relaxed from the previous stimulation.
C) is excited by a stimulus of increasing intensity.
D) must go through a rapid series of isolated twitches.
E) generates more and more thin and thick filaments.
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Question 7) If a second stimulus arrives before the relaxation phase has ended, a second, more powerful contraction occurs. This addition of one twitch to another is called
A) incomplete tetanus.
B) complete tetanus.
C) treppe.
D) wave summation.
E) recruitment.
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Question 8) A muscle producing almost peak tension during rapid cycles of contraction and relaxation is said to be in
A) incomplete tetanus.
B) complete tetanus.
C) treppe.
D) wave summation.
E) recruitment.
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Question 9) When a muscle is stimulated repeatedly at a high rate, the amount of tension gradually increases to a steady maximum tension. This state of maximum tension is called
A) incomplete tetanus.
B) complete tetanus.
C) a twitch.
D) wave summation.
E) recruitment.
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Question 10) The rapid rise and fall in force produced by a muscle fiber after a single action potential is a(n)
A) tetanus.
B) unfused tetanus.
C) twitch.
D) motor end plate potential.
E) muscle action potential.
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