If "this creature has no heart, and no lungs?"

Artistic License?

I mean, really, how many times will you look under Jabba's manboobs?

It must have some kind of circulation and respiratory system, just not a heart and lungs as we think of them. There are lots of earth creatures with alternative ways of making a living, so it was actually pretty good of the writers to put that detail in, even if they didn't explain it. Now as to how a creature from another planet happened to evolve two arms and legs, and facial features similar to ours, well... 
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Currently listening to: Leonard Bernstein, America Medley
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"Oh, well," said Zanoni, "to pour pure water in the muddy well does but disturb the mud!"