How does IP3 influence muscle contraction and nerve cell secretion?

IP3 directly binds to muscle fibers and nerve cells to initiate contraction and secretion.

IP3 releases calcium from the endoplasmic reticulum, which then triggers muscle contraction and nerve cell secretion.

IP3 inhibits calcium release, preventing muscle contraction and nerve cell secretion.

IP3 activates protein kinase C, which then causes muscle contraction and nerve cell secretion.