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6 Feb 2011
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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
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Document Summary

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. Know the difference of the medusa form about polyp. Myoepithielium: muscle fibers (no actual muscles muscles in the medusa) contract to push the jellyfish. Mesoglea stretch the myoepthilium back to its original state. Fish swim retrograde waves, send waves of contraction from head. Direct waves move in the same way as the organism moves.

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