PPT Slide
Cross bridging consists of myosin binding to actin
To release this binding, ATP is broken by ATPase [stored in myosin’s head]. Energy allows release of myosin from actin, and the ADP + P are stored in myosin head for future use.
When myosin releases from an actin and then binds with next actin on myofibril = Power Stroke
When myosin releases form cross bridge and returns to ‘resting’ position = Recovery Stroke
Full rest/recovery of muscle requires the active transport of calcium back to sarcoplasmic reticulum. Requires Achase, ATP
When calcium leaves troponin - then troponin/tropomyosin complex returns to actin’s binding site.