The Neuro-muscular Junction - http://www.wisc-online.com/objects/index_tj.asp?objID=AP2804
The Muscle Cell Contraction - http://www.wisc-online.com/objects/index_tj.asp?objID=AP2904

How Stuff Works (Senior School Edition)
Contracting a Muscle - http://health.howstuffworks.com/muscle2.htm
Excitation to Contraction to Relaxation - http://health.howstuffworks.com/muscle3.htm

Shockwave File - explaining the nerve-muscle synapse junction
http://www.bishopstopford.com/faculties/science/arthur/synapse.swf

Shockwave File - Excellent representation of the muscular contraction:
http://www.brookscole.com/chemistry_d/templates/student_resources/shared_resources/animations/muscles/muscles.swf

Slide Share - Muscle Function and Contraction
Link - http://www.slideshare.net/nick.johnstone/muscles/1


Worksheet - complements video - All Systems Go! Again!


Video - Nature Reinvented
http://faraday.theiet.org/naturereinvented/index.cfm