A hydrostatic skeleton is one in which the body's shape and/or function is maintained by an incompressible fluid such as blood or hemolymph. Such skeletons are mostly found in soft-bodied invertebrates such as such as earthworms and jellyfish. A fluid-filled cavity is surrounded by muscle fibres, which can contract to change the shape of the cavity. They have some similarities to Muscular hydrostats. A subset of the phases of matter, fluids include liquids, gases, plasmas and, to some extent, plastic solids. ... Jump to: navigation, search Red blood cells (erythrocytes) are present in the blood and help carry oxygen to the rest of the cells in the body Blood is a circulating tissue composed of fluid plasma and cells (red blood cells, white blood cells, platelets). ... Hemolymph (or haemolymph) is the blood analogue used by all arthropods and most mollusks that have an open circulatory system. ... Jump to: navigation, search A muscular hydrostat is a biological structure, found in animals. ...
Hydrostaticskeletons are similar to a water-filled balloon.
hydrostaticskeleton: a water-based skeleton present in many animals (such as the earthworm) that lack structures, such as bone, for muscles to pull against.
Vertebrates have a skeleton of bone or cartilage; arthropods have one made of chitin; while many other invertebrates use a hydrostaticskeleton, which is merely an incompressible fluid-filled region of their body.
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