BIOLOGY 120 Chapter Notes - Chapter 22: Exocrine Gland, Endocrine System, Cell Membrane

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Immune system: defense system that protects us against most infectious agents. Hypothalamus: main coordinator of the endocrine system. The hypothalamus contains neurons, which interact with the brain, and endocrine cells, which produce hormones. Some organs, such as the pancreas, function as endocrine glands, and also as ducted (exocrine) glands. Endocrine cells are also scattered throughout the lining of the stomach and intestine. Hormones: signaling molecules that tell other cells what to do under specific situations or at certain times in the life cycle of the individual. Endocrine system: where hormones are produced by specialized secretory cells. Endocrine glands: discrete organs that contains secretory cells that are often organized and release hormones into body fluids such as blood, which carries chemical messengers throughout the body. Endocrine glands do not have ducts/tubes that deliver secretions from the gland. How does an endocrine gland differ from an exocrine gland? directly to the site of action, however, exocrine glands are ducted.

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