| CA++ dependent means that the molecules that has to gain entry into the cells will have to attach itself with some of the CA++
anti dependent simply means those who are not dependent and can gain entry into the cells without them.
usually muscular activity involves CA++ dependent attachment.3
there are CA++ receptors on surface of the cell that are complementary to echother.
if you open "Biology by Campbell" any edition, i think there are 2 of them you will get a very good explanation of this activity. | 
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