You are watching Christina Aguilera on MTV Cribs. As she walks through her backyard, she trips over a rake, falls to the ground, and gets all dirty. You laugh uncontrollably and cannot help but smile for the next few minutes. In this situation, the __________ motor system is controlling your facial expressions.
A. extrapyramidal
B. paraventricular
C. pyramidal
D. ventromedial
Answer: A
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