muscle twitch

To understand the experiment on muscle twitch one should review the structure of skeletal muscle. How the muscle is able to contract minimally and maximally. This has something or everything to do with the so called motor units.

http://lessons.harveyproject.org/development/muscle/twitch~1.htm

take a look at this animation to understand how summation of forces can increase force of contraction

http://entochem.tamu.edu/VertInvertContractswf/index.html