Muscles are relaxed

myosin is not bound to actin

myosin is bound to actin

cross bridges have formed

myosin has bent toward the center of the sarcomere

myosin is not bound to actin

Explanation:

When the muscle relaxes the verve stimulation stops and the calcium is then pumped back into the sarcoplasmic reticulum which causes a break in the link between actin and myosin. Actin and myosin, therefore, return to their unbound state causing the muscle to relax.

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

cell division is not regulated in tumor cells.