Study GuideBiology–Chemical Coordination1. Hormones and GlandsThe animal body usestwo main systems to coordinate activitiesand keep everything workingtogether smoothly:1.Nervous coordination–fast, direct control using nerve impulses2.Chemical coordination–slower, long-lasting control using hormonesThis section focuses onchemical coordination, which is carried out by a group of glands called theendocrine system.1.1 The Endocrine System: Chemical CoordinationTheendocrine systemis made up of special glands located throughout the body. Some importantendocrine glands include thepancreas,thyroid gland, andadrenal glands.These glands release chemical messengers calledhormones.•Hormones are made ofproteins or sterol lipids•They travel through thebloodstream•They affect specific organs or tissues calledtarget organsRather than causing quick, short actions, hormones usually bring aboutslow but widespread andlong-lasting changesin the body.1.2 What Do Hormones Do?Hormones help coordinate body systems and regulate important processes such as growth,metabolism, and energy use.Here are two key examples:•Insulin○Secreted by thepancreas○Helpsglucose move into body cellsPreview Mode
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