define hormones in animals
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Hormone, organic substance secreted by plants and animals that functions in the regulation of physiological activities and in maintaining homeostasis. Hormones carry out their functions by evoking responses from specific organs or tissues that are adapted to react to minute quantities of them.
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A hormone is a chemical messenger which is a small soluble organic molecules that travels in blood and has its effect at a site different from the site from where it is made.
Examples of hormones are Insulin, glucagon, growth hormone,etc.
Based on the chemical composition & their origin animals have three types of hormones:
- Steroid hormones.
- Peptide hormones
- Amine hormones.
Hope it helps ☺️
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