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BIOB32H3 Lecture Notes - Lecture 4: Ontogeny, Aorta

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School
UTSC
Department
Biological Sciences
Course
BIOB32H3
Professor
jason brown

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Document Summary

Use drugs to determine whether myogenic or neurogenic by looking at its heart under microscope and measure heart rate. Only 2 groups of animals that have a true anatomical chambered heart (pump): vertebrates (fish, human, etc. ) and molest(?) In other animal groups, they have peristaltic pumps (not a true heart): pepperl blood through one direction: arthropods, some molests, analits, Animals that have neither (no circ system) => rely on diffusion to get ox and waste move throughout their body. Ontogeny (development of individual organism) recapitulates (plays out again) phylogeny (development of evolutionary linear over time) => if u look at indi organism, u can see the evolutionary past. Look at human heart development: look at day 20: development start to occur, no actual heartbeat yet. Looking at peristaltic pumps in arthropods (mainly in insects): structure labeled heart (in a functional way, no proper chamber), aorta opens up into a cavity (called hemocoel: to dump out extracellular fluid)

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