What is "constricts"

Usage examples of "constricts".

Mixing a dose with the stimulant which constricts the blood vessels will give you a few moments' grace, but not much.

Norepi constricts blood vessels, but that isn’t in as high a concentration.

He wants to cry out, but his throat constricts again, depriving him of speech.

Not a peep -- she is thrown but doggedly presses on with her prepared speech though her throat constricts a bit, her voice begins to rasp.

I flip on lights and my heart constricts as I realize the garage is empty.

If drawn up tight, it constricts movement and numbs the arms and fingers.