Hydrostatic Skeleton Mechanism
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
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.