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Chapters 44 & 45 – Osmoregulation, Excretion, and Endocrine Signaling …
Chapters 44 & 45 – Osmoregulation, Excretion, and Endocrine Signaling
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Transport Epithelia
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→ often form tubular networks (e.g., kidneys, gills, salt glands)
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Classes of Hormones
Water-soluble hormones (polypeptides, amines)
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Lipid-soluble hormones (steroids, some amines)
enter cells, bind internal receptors (cytosol/nucleus)
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slower, long-lasting changes
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Feedback Regulation
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Positive feedback
reinforces stimulus (e.g., oxytocin in childbirth)
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