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Transcript
“Calm Your Hormones!” The Endocrine System The Endocrine System A system of “ductless” glands that secrete hormones directly into the bloodstream Chemical “messengers” Distributed throughout body Only affect certain “target” cells If they have the corresponding receptor molecules The Endocrine System Pineal The pituitary gland called the “MASTER GLAND” because its hormones influence other endocrine glands hypothalmus *pituitary* parathyroid thyroid thymus adrenal *pancreas* *ovary* *testes* Negative Feedback Blood Sugar Maintenance More Blood Sugar Maintenance Nervous vs. Endocrine • Fast • short duration • Message is an electrochemical (impulse) • Impulses travel directly to effector • A bit slower • longer lasting • Message is a chemical (hormone) • Hormones circulate throughout body Nervous AND Endocrine Both • Regulate (maintain homeostasis) • Involve stimulus-response relationships • Use specially shaped chemicals (neurotransmitters or hormones) to transmit their message.
