Increases in muscle tension in the absence of any shortening of the muscle are said to be
A) contractions.
B) dynamic.
C) extensions.
D) isometric.
E) synergistic.
Question 2
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.
