Action potential is nerve impulse triggered when a neuron reaches its threshold, or trigger point for firing. Threshold trigger point for a neuron's firing about negative 50 millivolts.

A: it does not apply to only flip-flop but to all kinds of logic circuits where a [+] transition from a less negative to a more positive level occurs [-] and the other way around meaning a +/- transition must occurs to transfer states.

A mechanical breath delivered by the ventilator can be initiated either through a detected change in the flow in the circuit, or a detected negative pressure (so flow trigger or pressure trigger)

The positive or negative in the blood types refer to the Rh factor, which is an antigen. Antigens trigger immune responses. Being positive or negative for the Rh factor will impact who you can receive a blood donation from, and who you can donate blood to.

*static trigger *dynamic trigger *hold trigger