A muscle relaxes after contracting when
A. calcium is taken up by internal organelles.
B. internal ACh is broken apart by acetylcholinesterase (AChE).
C. troponin is taken up by internal organelles.
D. myosin and actin begin to interact.
Answer: A
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a. episodic b. semantic c. procedural d. redintegrative
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Which of the following groups of teenagers reports being the least likely to have had sex at least once?
a. African American girls c. European American boys b. African American boys d. Latin American girls
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