KINESIOL 2Y03 Chapter Notes - Chapter 9: Endoplasmic Reticulum, Troponin, Histology
11 Dec 2017
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Myosin heads are stored with energy with adp and phosphate calcium binds to troponin tropomyosin move out of the way and reveal active sites on actin myofilaments. Myosin heads attach to active sites on actin myofilaments (forms the cross- bridge) Energy stored in myosin head is used in power stroke movement. Myosin heads move at the hinge region; upright position disrupted in power stroke, actin myofilaments are pulled towards m line by the myosin. Myosin heads still stuck to actin myofilaments. Atp binds to myosin heads; myosin heads removed from active sites. Atp broken down by atpase into adp and phosphate. Myosin head goes back to upright position if calcium is still bound to troponin, the cycle will repeat. Calcium is reused there is a pump on the sarcoplasmic reticulum that takes calcium from the sarcoplasm and puts in back into the sr this pump needs atp.
