Table 1. Comparison of structure, function, and behavior of the five (5) major echinoderm classes. Class Method Food Skeleton Location Locomotion Predator of eaten structure of tube defense feeding feet Echinoidea long tube ossicles fused into rigid interlocking entire plates (called a test) www feet covering body surface grabs prey with arms; everts ww w stomach Ophiuroidea detritus can drop off arms and escape Holothuroidea tube feet walking feather stars small calcium can walk on plates called ossicles appendages called cirri; some can ww www swim using their arms

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Muscle Action

A change in the body or a bodily organ as a result of its functioning is referred to as an action. Muscle action can be defined as the specific movement of a bodily part generated by the contraction of a muscle. The muscle proteins actin and myosin are the important contractile proteins involved in muscle action. Muscle contraction, in addition to movement, serves several other important functions in the body, including posture, heat generation, and joint stability. Muscle contraction maintains posture, which includes standing and sitting.