Many things can happen...an increase in heart rate, blood pressure, decrease in respiration...many many other events.
Serve as transmitters for sympathetic nervous system
a medicine
Because it causes less cardiovascular side effects than common epinephrine
Epinephrine is used to minimize the bleeding. It constricts the blood vessels, so there is less blood loss. I imagine there will still be some bleeding, though. Epinephrine is also known as...