Question

what is hydroskeleton​

Answer 1

Answer:

Hydrostatic Skeleton

A hydrostatic skeleton, or hydroskeleton, is a flexible skeleton supported by fluid pressure. Hydrostatic skeletons are common among simple invertebrate organisms. While more advanced organisms can be considered hydrostatic, they are sometimes referred to as hydrostatic for their possession of a hydrostatic organ instead of a hydrostatic skeleton. A hydrostatic organ and a hydrostatic skeleton may have the same capabilities, but they are not the same. Hydrostatic organs are more common in advanced organisms, while hydrostatic skeletons are more common in primitive organisms. As its name suggests, containing hydro meaning "water", being hydrostatic means that the skeleton or organ is fluid-filled.

Answer 2

Answer:

Hydrostatic skeletons (sometimes just called “hydrostats”) use a cavity filled with water; the water is incompressible, so the organism can use it to apply force or change shape. Plants use osmotic pressure to pressurize the cavity, whereas animals do it with muscle layers in the hydrostat's walls. The most common muscle arrangement is to have a layer with lengthwise or longitudinal fibers and a layer with circular or circumferential fibers. Most hydrostatic skeletons are more or less cylindrical, so longitudinal muscles will tend to shorten them and also widen them due to constant volume, whereas circumferential muscles will tend to do the opposite. The longitudinal and circumferential muscles are thus antagonistic.