Ch 45 Endocrine - Chapter 45 Chemical Signals in Animals...

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Chapter 45 Chemical Signals in Animals
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Hormones are chemical signals. The endocrine system consists of: Endocrine cells which are hormone-secreting cells and Endocrine glands which are hormone- secreting organs. Specific target cells respond to specific hormones.
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Homeostasis Growth and Development Reproduction Energy Metabolism Behavior
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blood glucose low stimulates glucagon from pancreas glucose release from liver stimulates blood glucose high inhibits
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respons e endocrine cell target cell hormones receptor protein
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respons e endocrine cell target cell hormones intracellular receptor
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Tropic hormones - stimulate the production and secretion of hormones by other endocrine glands; ex. TSH Nontropic hormones - stimulates cellular growth, metabolism, or other functions; ex. thyroxine
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Invertebrates have a wide variety of hormones that are involved in the regulation of homeostasis. Invertebrate nervous systems clearly illustrate endocrine and nervous system interactions
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An example from hydra: One hormone stimulate asexual reproduction. Another hormone prevents sexual reproduction. An example from a mollusk: The hormone that regulates egg laying also inhibits feeding and locomotion.
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Arthropods have extensive endocrine systems regulating molting in insects and crustaceans. The regulation of molting in insects. Ecdysone also promotes the development of adult features. Neurosecretory cells in the brain produce Prothoracicotropic hormone (PTTH) , which regulates the secretion of ecdysone. Juvenile hormone (JH) promotes the retention of larval characteristics.
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Different signal-transduction pathways in different cells can lead to different responses to the same signal.
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Frog Metamorphosis thyroxin
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Major endocrine glands: Adrenal glands Hypothalamus Pineal gland Pituitary gland Thyroid gland
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This note was uploaded on 04/20/2011 for the course BIOL 172 taught by Professor Huddleston,m during the Spring '08 term at University of Hawaii, Manoa.

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Ch 45 Endocrine - Chapter 45 Chemical Signals in Animals...

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