Do jellyfish have any muscles?

They are 95 percent water and have the most basic nerve system of any multicellular organism. A typical jellyfish is composed of two structures: an external epidermis and an internal gastrodermis. This forms the bell, from which the tentacles flow. read more

Jellyfish do have muscles (as do all members of the phylun Cnidaria). They have "bell muscles" which pull on water-filled compartments. This is called a hydrostatic skeleton. read more

All jellyfish have nematocysts, however some jelliespossess very weak nematocysts meant for tiny prey like copopods.The stinging cells in these jellies are generally not felt byhumans with the exception of sensitive skin. Cnidarians do notpossess brains, but some have eye spots for sensing light. read more