There is a really good web site on Muscle Tissue Physiology belonging with copyrights to Mc Graw Hill Higher Education, Get Body Smart© 2000-11.
Just click on the link below:

http://www.getbodysmart.com/ap/muscletissue/menu/menu.html

Muscle fiber picture taken from: Original page: http://infinitybody.com/want-to-really-transform-your-body-understand-muscle-fiber-types-first/
VIDEO OF CROSS BRIDGE CYCLE:
http://highered.mcgraw-hill.com/sites/0042561336/student_view0/chapter9/breakdown_of_atp_and_cross-bridge_movement_during_muscle_contraction.html

this link is from the GLENCOE ON LINE LEARNING CENTER.