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Hormone1 - internal is"external" to individual...

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Hormones / Target Cells A. Chemical Signals -- Chemoreception 1. Food, Pheromones, Hormones, Neurotransmitter 2. Earliest organisms (single celled prokaryotes) a. mechanisms for detecting external signals for food, for sex. b. sensory transduction: external signal >> cell curface Receptor >> internal signal 3. Multicellular organisms... a. elaborate mechanisms for detecting and responding to sigals b. external signal detection (organismic) c. "internal" signal detection
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Unformatted text preview: - internal is "external" to individual cells, tissues, organs, etc. 4. Evolutionary origins of hormones / pheromones. .. a. Cells / organisms leak out specialized metabolites. b. other cells "pick up" / detect metabolites >>> "respond" c. Evolutionary Selection d. e.g. fish pheromones are steroid sex hormones / hormone metabolites- males opportunistically monitor for presence of hormones in water- male physiology and behavior responds. .....
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