do catecholamine,neurohormon and neurotransmitter are the same?

Answer 1

Catecholamines are compounds synthesized from the amino acid tyrosine. Examples include epinephrine (adrenaline), norepinephrine (noradrenaline) and others. They are produced predominantly in the adrenal gland but also in sympathetic ganglia and nerve endings. They have effects both locally where they are produced (at sympathetic nerve endings) and by circulating in the blood stream. Adrenaline, for instance, is released when you are frightened or angry. It increases the heart rate, makes the heart beat more forcefully, tightens the sphincters and slows down the movement of the intestinal muscles, diverts blood flow from the gut to the muscles and so on. It also makes the hair stand on end.
Neurotransmitters are chemicals released by nerve endings which carry signals either to the next nerve ending or to the organ which is being supplied by the nerve. These may be catecholamines but also include acetylcholine and others. Acetylcholine carries nerve impulses across the gap between adjacent neurons and also from nerves to the muscles they supply.
Neurohormones, like neurotransmitters are released by nerve endings but are carried by the blood circulation to have effects in other parts of the body. For instance vasopressin is secreted by the hypothalamus and posterior pituitary and acts on the kidney to concentrate the urine. It is a common respose to dehydration and is also associated with thirst.

Answer 2

Not the same.