![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
Once the stimulus alters the receptor on the cell's membrane, what happens next?
A.
Ion channels open, allowing ions to enter or exit.
B.
The membrane permeability is altered.
C.
A second messenger is activated on the inside of the cell.
D.
Any of these actions could happen next.