Question+1

**Question #1 **
Watch the video below. Think about "muscle control".


 * 1) What does the yellow "knob" represent?
 * 2) What does the blue rectangle represent?
 * 3) Explain what the red dots represent and what they do.

media type="file" key="neurotransmitter.m4v" width="300" height="300"

Animation Source: http ://faculty.washington.edu/chudler/synapse.html