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Questions about bladders

I know they're not the best pics but it's hard to take pics under a microscope... http://groups.msn.com/safesaf....oID=347
picture of a terrestrial bladderwort bladder (I'm not sure which one... since the it came up by itself.. sort of... lol... might be U. livida though)
another pic http://groups.msn.com/safesaf....oID=348
http://groups.msn.com/safesaf....oID=351 close up
now my question about them... how the heck do they trap anything? they're full of those hair like things. do the protists and lil tiny animals go in through the hairs or how?
what's that pink thing?

now another species (I think it's U. inflata)... the trigger hairs-
http://groups.msn.com/safesaf....oID=352
http://groups.msn.com/safesaf....oID=357
what are those little sphere things? they're all over the outside of the bladder and on the hairs. any ideas?

http://groups.msn.com/safesaf....oID=360
cross section of a bladder- yes, I did slice it myself :p I took the biggest bladder I could find, took a razor from a pencil sharpener (it's great for microscope stuff!) and sliced it.

now... if look REALLY closely and with imagination (LOL... stupid camera that doesn't show them) you can make out hair like things on the inside of the bladder. See that bump? it's that darker portion.
now... why do bladderworts have this? are they the glands? do they absorb the nutrients? what's the deal?
 
I can not answer any of the questions, but cool pictures.
 
the hairs you see are trigger hairs, when an insect touches them, it is sucked into the bladder and digested.
 
The inside of Utric bladders are supposed to be covered with glands, and the shape of the glands are sometimes used in species identification.
 
ok, what are the little round things on the outside of the bladder and the hairs?
 
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