BIOL 225 Chapter 38_Au - Announcements Plant care water...

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Plant care – water plants and collect data!! Formal lab report – oxygen consump. designed expts complete draft due tomorrow 11/11 (on Sakai assign. 15 min before lab begins & two hard copies at start of lab) peer review due F 11/14 Animal development lab – print & read exercise for tomorrow 11/11 prelab due on Sakai assignments 15 min before lab Exam 3 in one week – Mon 11/17 Announcements
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Animal Endocrine System (hormones) Chapter 38
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Outline Animal hormones What are hormones? How do they work? Negative and positive feedback Control of blood glucose levels by negative feedback Pituitary & Hypothalamus Amplification of a hormonal response Vertebrate stress response Other forms of chemical signaling
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Endocrine and nervous systems control the body in different ways Nervous system responses are: Fast Short duration Hormonal responses are: Slower Longer-lasting When are hormones advantageous? Coordinating whole-body responses Regulating long-term developmental processes
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Secretory vesicles Target cell Blood vessel Hormone molecules Endocrine cell Hormones move through the blood from endocrine cells to target cells
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Two categories of hormones are perceived by cells differently Amino-acid derived hormones (peptide & amine hormones) Hydrophilic, cannot cross membrane Perceived on cell surface Steroid hormones Hydrophobic, can cross membrane Perceived inside cell Same general signaling process Reception – hormone binds to specific receptor
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AA-derived hormones bind at the cell surface
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Steroid hormones bind intracellular receptors inside the cell Cellular response to steroids always involves changes in gene expression
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