Fact 1: Dilation occurs when cell walls relax.

Fact 2: Dilatation is the widening of the cervix using progressively wider metal rods.

Given the two facts above, answer the question "When cell walls relax they" with the following options: 
- migrate
 - slows
 - nektar
 - vibrate
 - sweat
 - widen
 - expand
 - heat


 

      widen   