In 1913 Bohr proposed his quantized shell model of the atom to explain how electrons can have stable orbits around the nucleus.n 1913 Bohr proposed his quantized shell model of the atom to explain how electrons can have stable orbits around the nucleus.
Norepinephrine, also called noradrenaline, is an organic chemical in the catecholamine family that functions in the human brain and body as a hormone and neurotransmitter.n the most basic terms, the function of norepinephrine is to mobilize the brain and body for action. Norepinephrine release is lowest during sleep, rises during wakefulness, and reaches much higher levels during situations of stress or danger, in what has been called the fight-or-flight response.
Epinephrine and norepinephrine are similar compounds , they are adrenergic neurotransmitters with a catecholamine ring . Epinephrine and norepinephrine are also known as adrenaline and noradrenaline respectively.Both of them are directly acting sympathomimetics i.e., they act directly on alpha and beta receptors.