The top long-distance runners probably have _______ proportion of slow muscle fibers in their leg muscles.
A. a higher
B. a lower
C. the same
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Question 2) In a lab, wave summation is demonstrated by increasing the _________ of the stimulus.
A. intensity
B. frequency
C. capacitance
D. warm up time
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Question 3) Which contraction occurs when you try (unsuccessfully) to move a wall?
A. Isometric
B. Isotonic
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Question 4) . During REM sleep, muscle tone decreases significantly.
Indicate whether this statement is true or false.
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Question 5) A continuous, smooth contraction of muscle in which twitches are fully fused is referred to as _________.
Fill in the blank with correct word.
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Question 6) Staircase and warming-up effect refer to ___________, an increased muscle response to a constant stimulus.
A. wave summation
B. treppe
C. multiple motor unit summation
D. incomplete tetany
E. isotony
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Question 7) Muscle tone is a result of _________ nervous system activity, and it acts to _________ joint position.
A. involuntary, stabilize
B. involuntary, continuously vary
C. voluntary, stabilize
D. voluntary, continuously vary
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Question 8) In a graph of wave summation, the tension level returns to baseline between each peak of force.
Indicate whether this statement is true or false.
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Question 9) Consider the difference between lifting a light pad of paper versus a heavy textbook. The primary way the level of force of muscle contraction is controlled is by
A. recruiting a different number of motor units.
B. activating different regions of the muscle.
C. activating the motor units at a different frequency.
D. altering the number of crossbridges each individual fiber uses.
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Question 10) A graph of a muscle twitch contains three periods. The period during which there is no change in external muscle tension (and no change in muscle length) is the ________ period.
Fill in the blank with correct word.
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