This questions pertains to the cross bridge cycle of muscle movement.

what is the functional structures for muscle movement? Does it involve 1 cell, more than one cell or is it within a cell?

*The functional structures for muscle movement are actin and myosin.

*The cross bridge cycle forms within the muscle cell.

Step-by-step explanation

*The functional structures for muscle movement are actin and myosin.

*The cross bridge cycle forms within the muscle cell.

*In a muscle cell there are many sarcomeres which consists of thick and thin bands.

*Cross bridge cycle is attachment of myosin with actin whithin the muscle cell.

*Cross bridge cycle occurs in four steps

-The activated myosin head binds to actin to form cross bridge and inorganic phosphate is released making bond between actin and myosin stronger.

-Now ADP is released and activated myosin head pivots sliding thin filaments towards centre of sarcomere.

-Then when other ATP binds to the myosin head the bind between actin and myosin weakens and myosin head detaches.

-Then reactivation of myosin head takes place by hydrolysing ATP.