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9. Chemical Signals in Animals post

9. Chemical Signals in Animals post - Chapter 45 Chemical...

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Chapter 45 Chemical Signals in Animals
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Regulatory Systems Homeostasis, Growth, Reproduction Nervous System Fast Short-term Endocrine System Not as fast Can be long-term
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Chemical Signals Hormones Chemical signal Target cell Receptors Endocrine gland/cell Controlled release Effective at small quantities 10 -8 to 10 -12 M Different species Related substances Similar or same function
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Actions of Chemical Signals Types of Action Autocrine Paracrine Neurotransmitter Endocrine Neuroendocrine
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Endocrine Glands 1849 Berthold Castrated cockerels Testicular implants 1889 Brown-Séquard 1890 (12,000 physicians) Endocrine Function Ablation Replacement
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Classes of Hormones Amino acid derivatives Tyrosine Catecholamines NE, Epi, Dopamine Thyroid Hormone Steroids Estrogens Androgens Cortisol Peptides Insulin
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Packaging and Transport of Peptides Transcription and Translation Endomembrane system RER Golgi Secretory vesicles Exocytosis
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Packaging and Transport of Amines and Steroids Synthesized by enzymatic reaction Quick Storage Amines Vessicles Steroids None
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Mechanism of Action Depends on location of receptor location
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