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Q: What is the source of energy on the myosin head?
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When does the myosin head cock back to store energy for the next cycle?

After the myosin head detaches, energy from ATP hydrolysis is used to re-cock the myosin head.


What substances causes the myosin head to change shape?

The myosin head changes shape mid-reaction, when the energy released by hydrolysis of ATP is absorbed by the myosin head.


How does myosin head obtain the energy required for activation?

The energy comes from the hydrolysis of ATP


What converts the myosin head into the high-energy state?

ATP hydrolysis


What acts as ATPase during the contraction cycle of muscle?

myosin cross-bridges


What immediately follows the binding of ATP to the myosin head?

The myosin head pivots, moving the actin strand.


Difference between actin and myosin?

Myosin is a molecular motor that converts ATP to energy. Actin is responsible for cell movement and uses energy from the ATP conversion done by myosin..


Which molecule binds to the myosin head in order to break the actin-myosin bond?

ATP


What happens to calcium ions and tropomyosin to cause a muscle to relax?

Calcium ions are pumped back into the sarcoplasmic reticulum. A free ATP will come in and restore the myosin head back to 90 degrees preparing it again for another powerstroke. It's important to note that the myosin head does NOT hydrolyze the ATP. Only in a powerstroke it will hydrolyze the ATP to use the energy to bend the myosin head 45 degrees. If there is no free ATP to release the myosin head from it's bent angle then it remains rigid. That is why when a person dies their muscles stiffen because there are no free ATP to release the myosin heads from the actin filament.


What does the release of ADP and P from the myosin head cause?

The release of ADP and P from the myosin heads causes the myosin heads to change shape.


What is a myofilament with a knob like head?

Myosin


What is the myofilament with a knob like head?

Myosin