Muscle contraction occurs in a cyclic process. which of the following sequences is in the correct order? muscle contraction occurs in a cyclic process. which of the following sequences is in the correct order? power stroke, cross bridge formation, cross bridge dissociation, cocking of myosin cross bridge formation, power stroke, cross bridge dissociation, cocking of myosin cross bridge formation, cocking of myosin, power stroke, cross bridge dissociation cross bridge formation, cross bridge dissociation, cocking of myosin, power stroke cross bridge formation, power stroke, cross bridge dissociation, power stroke, cocking of myosin

cross bridge formation, power stroke, cross bridge dissociation, cocking of myosin  

Explanation:

The signal for the beginning of muscle contraction is acetylcholine (Ach) released from the presynaptic cell which then binds to its receptor on the muscle cell. This event causes depolarization and consequently the release of Ca ions from the sarcoplasmic reticulum. Ca helps the formation of actin-myosin cross bridge. The movement of myosin heads causes the move of actin and this process is called power stroke. In the absence of ATP, the myosin head will not detach from actin(ATP binding causes the myosin head to detach from the actin and causes cross bridge dissociation). Energy released form the ATP hydrolysis changes the myosin head into a cocked position.

the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

explanation: