ISCI 1A24 Lecture Notes - Lecture 19: Tetraodontidae, Tetrodotoxin, Homeostasis
29 Sep 2016
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Eat algae, crustaceans teeth for scraping, crushing. One of top 3 most poisonous vertebrates (next to poison dart frogs and cobras) tetrodotoxin. Can expand to 2 to 3 times its regular size. Fugu delicacy of sushi from puffer fish; just enough toxin present that your tongue tingles; saved by the bell = bell tied to toe to indicate if buried individual was still alive. Intro to neuron function, action potential, and neurotransmitters. Cellular and biochemical interactions of an organism. Feedback loops homeostasis process associated with the maintenance of a constant state: Ability or tendency of an organism to maintain internal equilibria by adjusting physiological processes against external fluctuation. Regulatory processes of homeostasis depend on the principle of feedback. Positive process (series of effects) that reinforces/amplifies that process to continue. Negative process (series of effects) that negates/subdues that process from continuing; maintains homeostasis; more common than positive feedback. Intercellular communication key to homeostasis; 6 main chemical modes of communication:
