Chapter 18 part 1.pdf - Chapter 18 The Endocrine System part 1 Activities of the organ systems are coordinated by the nervous system and the endocrine

Chapter 18 part 1.pdf - Chapter 18 The Endocrine System...

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7/16/2018 1 Chapter 18 The Endocrine System part 1 Activities of the organ systems are coordinated by the nervous system and the endocrine system . Nervous system local fast-acting Endocrine system affects many cells, tissues and organs is long lasting ENDOCRINE SYSTEM OVERVIEW The endocrine system 1.Works with the nervous system to maintain homeostasis 2.regulates long-term processes that involve many tissues. Examples are growth development reproduction response to stress
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7/16/2018 2 pituitary pineal thyroid parathyroid (behind thyroid) suprarenal pancreas** gonads** ENDOCRINE SYSTEM OVERVIEW *** also have non- endocrine functions hypothalmus heart thymus kidneys intestines ENDOCRINE SYSTEM OVERVIEW Hormones are also released by these non-endocrine organs: Control of the endocrine system by the nervous system is carried out by: hypothalmus autonomic nervous system INTERCELLULAR COMMUNICATION The endocrine system coordinates physiological processes by intercellular communication . Chemical signaling molecules are used to communicate between cells. types of intercellular communication direct communication synaptic communication autocrine communication paracrine communication endocrine communication
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7/16/2018 3 INTERCELLULAR COMMUNICATION direct communication : ions and small molecules diffuse directly from the cytoplasm of one cell to the cytoplasm of another through gap junctions . Is found between ciliated cells of some epithelia cardiac muscle cells ENDOCRINE COMMUNICATION Synaptic communication: chemical signals, called neurotransmitters , are released from the synaptic terminals of neurons by exocytosis, and act by binding to a specific receptor protein on a target cell. receptors in target cell membrane synaptic terminal PARACRINE COMMUNICATION paracrine factor molecules receptor Paracrine communication: chemical signals (called paracrine factors ) are released by exocytosis and act on nearby cells. Paracrine factors affect target cells by binding to protein receptors in the target cells. Autocrine communication: chemical signals are released by exocytosis and act on the same cell
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7/16/2018 4 ENDOCRINE COMMUNICATION endocrine communication: chemical signals, called hormones , are released by exocytosis into the bloodstream..
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