Bob tried to open a jar of pickles, but the lid did not budge. The muscles of his hands and arms were
A) in isometric contraction.
B) in dynamic contraction.
C) locked in a stretch reflex.
D) in motor pools.
E) in extension.
Answer: A
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Children are most likely to enjoy and continue to participate in a sport when
a. winning is emphasized over skill development. b. coaches criticize players for bad plays. c. coaches have realistic expectations and demands for players. d. coaches badmouth opponents and referees.
In the two groups of descending tracts in the motor system, neurons of the ________ control the movements of the body trunk, whereas neurons of the ________ control movements of the hands and fingers
a. ventromedial group; lateral group b. primary motor cortex; secondary motor cortex c. lateral group; ventromedial group d. premotor cortex; nigrostriatal bundle e. secondary motor cortex; primary motor cortex