BIOL-2220 Lecture Notes - Lecture 3: Motor Neuron, Jerky, Catabolism
23 Jan 2018
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Document Summary
The action potential just doesn"t go around the outside of the cell, but goes inward because of t tubules. T tubules- each side of t tubule we have terminal cisternae which are part of sarcoplasmic reticulum. The sarcoplasmic ret is a storage house for calcium and as action potential passes by the cisternae it stimulates the release of calcium from storage. The terminal cisternae release calcium into the sarcoplasm. Muscle contraction high to low and that"s what cause the pulling and creates short and thick: everyone for themselves, not in unison! High to low configuration that pulls the microfilament towards to m line. Once it is pulled it has gone from high to low and atp binds back to that receptor site, and it has to let go of actin low. Energy gets split, goes back to high energy configuration and the process repeats itself until sarcomere is shortened. Power stroke is attaching pulling thick to thin.
