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It is caused by the neurohormone called norepinephrine.
an explanation of how or why something happens is called a hypothesis.
A verb form used to show when something happens is called tense.
twice-a-day or it can be called semi-diurnal which relates to such occurrences as tides.
an event
Karma
When you breath in the cigarette/cigar/pipe/pot/hookah smoke, you are inhaling. When you breathe out you are exhaling. Sometimes exhaling can be called "making smoke rings" if you try to do something fancy with your breath.
A quick involuntary response to a sensory stimulus (e-g knee-jerk) is called
Dejavu
It's called payback
A possible explanation is called a hypothesis.
The probability of whatever it was that happens.