The system activates when the patient enters the bed.

I fear my scan systems have just activated the bomb.

A system activated daemon so exits when not in use.

Essentially, the sympathetic nervous system activates the fight-or-flight response we spoke of earlier.

Some systems can also activate closed-circuit television to record or assess the event.

Its systems activated; it powered up, ready to serve.

"All systems activated," a tactical officer announced over the speaker system.

The sprinkler suddenly system activates, raining blood down on everyone inside.

In my experience, the system activated when I was changing lanes or just following a bit too closely.

The system can activate central alarms or shut down distribution systems in affected areas.