[Depex 3] Endocrine System

• Chemical Messenger - any substance produced by a cell; plays a physiological role in the control of the activity of another cell
• Hormone - any substance elaborated by one cell to regulate another cell
• Hormone - serve as the body's chemical messengers
• Tropic Hormone - hormone which regulates the secretions of other endocrine tissues or organs
• Neurohormone - hormone produced by a nerve cell
• Neuropeptide - peptidergic neurohormone (i.e. a neurohormone comprised of chains of amino acids)
• Neuromodulator - hormone that modulates the response of a neuron to a neurotransmitter or another hormone
• Neuroregulatory - generalized term for any neurohormone that acts as a neurotransmitter or neuromodulator
• Pheromones - chemical messengers released to the exterior of an animal to stimulate a response in another member of the same species
• Lumones - chemical messengers released into the lumen of the gastrointestinal tract
• Chalones - putative cellular mitotic inhibitors; inhibit the proliferation of immature cells
• Growth Factors - mitogenic substances; can affect the growth of cells that promote or inhibit mitosis