There is no consensus of what actually happens to initiate the onset of labor. It is thought to be a combination of maternal and fetal factors that occur in such a way that labor begins. What is the term used to describe the way maternal and fetal factors interact to cause labor to begin

The missing options are:

a) Pyramid effect

b) Waterfall effect

c) Pathway effect

d) Cascade effect

The correct option is d) cascade effect.

Explanation:

A cascade effect is a series of reactions that happen as a consequence of the previous reaction and that it gradually expands throughout a system. If we think of the cascade effect during labor, we can see that there is an initial reaction that initiates the cascade and continuous during the different stages of labor.