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Re: Twitching Muscles! [HAPP-L]

Twitching muscles are typically due to one of three physiological 
phenomena: (a) spontaneous release of Calcium from the SR, which 
initiates excitation-contraction coupling in a few isolated skeletal 
muscle cells; (b) spontaneous action potential in a motor neuron 
innervating a few skeletal muscle cells (i.e. very small motor unit); 
(c) spontaneous release of Ach from the motor neuron due to calcium 
leak, thereby initiating excitation-contraction coupling in a small 
motor unit.

Robert B. Tallitsch, Ph.D.
Professor of Biology
Augustana College
639 38'th Street
Rock Island, IL.  61201-2296
Internet: bitallitsch@augustana.edu
Office telephone: (309)794-3441
FAX: (309)794-7722 (please mark to my attention)

World Wide Web information about Dr. Tallitsch, the courses he
teaches, and Augustana College is available at: