Biology / Bio 3081 · Atom · ~20 seconds
Hydrostatic Skeleton Mechanism
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State
A hydrostatic skeleton supports a soft body using fluid held under pressure inside a body cavity, against which surrounding muscles contract to change shape and move.
Show
An earthworm shortens and lengthens segments by contracting circular and longitudinal muscles against its fluid-filled coelom.
Watch for
A hydrostatic skeleton needs no rigid material at all — the fluid itself does the resisting.
Builds on
- Nothing — this is a starting point.