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Lecture

Jan. 25 Lecture notes


Department
Biology
Course Code
BIO325H5
Professor
Glenn Morris

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Jan. 25 Lecture notes
MISSING FIRST 2 MINUTES
Starfish
-radial canal and osicle
- as you reduce the volume in the ampula the volume foes into the tube foot making it longer
(not wider because of retractor muscles)
-hold on to its prey (bivalves) using its tube foot
-a glue like substance is excreted on the shell of the bivalve and its becomes a tug of war
-evert their stomach
-know the difference of the medusa form about polyp
-mesoglea
- myoepithielium: muscle fibers (no actual muscles muscles in the medusa) contract to push
the jellyfish
-mesoglea stretch the myoepthilium back to its original state
Retrograde waves vs direct grade waves
-compare them (especially how they work)
-fish swim retrograde waves, send waves of contraction from head
-Direct waves move in the same way as the organism moves
-Snakes also use retrograde waves
NEXT CLASS: side winder
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