01:119:115 Lecture Notes - Lecture 13: Negative Feedback, Neurohormone, Positive Feedback
18 Mar 2018
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Seq vertebrate endocrine pathways (skimming: chapter 45. 2, 11. 1, 11. 2) Control of hormone regulation: feedback regulation (review, stimulus -> detection -> response, negative feedback = reduce the stimulus, positive feedback = enhance the stimulus, water - soluble (fast, hydrophilic) vs lipid-soluble pathways (slower, hydrophobic) (figure 45. 5) Simple endocrine pathway (45. 10: endocrine cells respond directly to stimulus. C. simple neuroendocrine pathway (45. 11: stimulus received by sensory cell, stimulates neurosecretory cell. Not all endocrine pathways are negative and not all neuroendocrine positive. Early larva -> later larva -> pupa -> adult: uses two organs in arthropods: i. ii. Uses three hormones: (45. 12: jh = juvenile hormone, ptth: prothoracicotropic hormone make ecdysteroids , ecdysteroids = molting hormones. B. pathway: ptth and jh: after hatching, caterpillar: Hypersecretion = a higher level of jh (or other hormone) Hyposecretion = not enough secretion (what would happen if jh is sprayed on insect infected fields?) (sprayed ecdysone on the field?)
