What is the next step in muscle contraction after calcium ions bind to actin?

I think that after calcium and actin bind, actin starts changing shape.

Hope it helped,

BioTeacher101

i think that d. wind is the answer.   i missed the question when i answered a. currents.

as in mitosis, dna replication occurs during interphase.   in meiosis, it occurs specifically in s phase of interphase 1.