Forexample epinephrine, norepinephrine and dopamine, collectively called catecholamines,are synthesized from the aromatic amino acids phenylalanine and tyrosine (Figure 2) inthe brain and in the adrenal medulla. Frequently the synthesis of hormones is under thecontrol of other hormones.
http://www.umich.edu/~kcourses/w99/mvs442/chapter1.pdf
Atrial natriuretic factor; a hormonal substance produced by the right atrium of the heart that stimulates the excretion of sodium and water by the kidneys and helps regulate blood pressure.
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Messages delivered to adjacentcells and through circulating plasma are respectively called paracrine and endocrine.Nerve cell chemical messages delivered in a paeacrine fashion across a synaptic gaprepresent neurotransmission, and through the blood, neuroendocrine action.
http://www.umich.edu/~kcourses/w99/mvs442/chapter1.pdf
In any case, the endocrine system is responsible for releasing your hormones. Check your text book next time! Chemical messengers of the endocrine system are called hormones. hormones. Hormones. hormones. Hormone. Hormones. HORMONES. Endocrine glands secrete hormones.
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The major endocrine gland. A pea-sized body attached to the base of the brain, the pituitary is important in controlling growth and development and the functioning of the other endocrine glands.   .
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11Chapter 1 Characteristics of chemical messengers Hormones are chemical messengers Hormones are signalling molecules synthesized within the body that regulate andcoordinate physiological and metabolic functions by acting on receptors located on or intarget cells.
http://www.umich.edu/~kcourses/w99/mvs442/chapter1.pdf
Thyroid gland Anterior aspect of the neck Calcitonin, 3,5,3’-triiodothyronine (T 3),thyroxine (T 4)Figure 1. The types of chemical messenger actionChemical messages are transmitted to specific receptors through the extracellular fluidsor across the synaptic gap.
http://www.umich.edu/~kcourses/w99/mvs442/chapter1.pdf
An example of a paracrine messenger is somatostatin in the pancreaticislets acting on adjacent insulin and glucagon cells. Sometimes the signalling moleculesare released by the cell into the interstitial fluid space to act on the receptors of the cellthat produced them.
http://www.umich.edu/~kcourses/w99/mvs442/chapter1.pdf
A chemical substance produced and released into the environment by an animal, esp. a mammal or an insect, affecting the behavior of physiology of others of its species.
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A hormone produced in the pancreas by the islets of Langerhans that regulates the amount of glucose in the blood. The lack of insulin causes a form of diabetes.
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what is the chemical messenger for the endocrine system
Hormones are the chemical messenger for the endocrine system.