That’s for a BJT or similar. There’s other kinds of transistors, and CMOS digital logic is based on MOSFETs. In MOSFETs, it’s gate, source and drain. If you apply the right voltage (negative for p-type, positive for n-type) to the gate of a MOSFET, the resistance between the source and drain skyrockets. It’s like pinching off a hose. Ideally when fully closed it’s like there’s no connection at all. (And the gate shouldn’t ever conduct - it just controls the channel between source and drain)
This is pretty much the whole principle behind CMOS, by the way. It’s a bunch of hoses pinching each other on and off in such a pattern that it preforms logic. It’s easy to manufacture on a chip for reasons I won’t go into unless you really want.