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Unformatted text preview: But the Ca++ from the channels that activate the muscle contraction isn’t from the tubules, it's from the sarcoplasmic reticulum. The channels in the T-tubules is voltage sensitive, that once the action potential passes by, it senses it, and the T-tubules is activated and changes shape, pushes the linkage between itself and the sarcoplasmic reticulum, and then the SR channels open. HUGE amount of Ca++ flows out of it and the concentration of Ca++ in the muscle spikes up and causes the muscle to contract by a biochemical change from the [Ca++]. 10-20-10 October 20, 2010 11:47 AM Mus. ANS Page 1 Regulation of force of the muscle fibers Slow, fast, fast glycolytic fiber. +[K+] = muscle depolarization +[ADP] 10-22-10 October 22, 2010 11:48 AM Mus. ANS Page 2...
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- Fall '07
- sarcoplasmic reticulum, end plate potential