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.
Norepinephrine is classified as a catecholamine chemical that plays a significant role in how the body responds to stress. The body's fight-or-flight response is coordinated by both epinephrine (adrenaline) and norepinephrine (noradrenaline).he body's flight-or-fight system is designed to prepare the body for a perceived threat or stressful situation. Norepinephrine assists in this process by increasing blood sugar levels, opening up the bronchial airways, and converting bodily fats to fatty acids.