jellyfish is a relatively low level of marine life. Although their body structure is relatively simple, they can also be allowed to move freely. If you observe jellyfish for a long time, it is also easy to observe their activities, at this time like a round umbrella floating in the water. Especially when the color of jellyfish is beautiful, this scene is very beautiful.
As mentioned above, like most animals, jellyfish can also move, but the way they move is different from many other animals. Specifically, jellyfish control their own activities by squeezing and contracting the lumen. Jellyfish have muscle fibers in their epidermis, which are distributed over a wide range from their top to their end. These muscle fibers play a role in controlling the contraction and expansion of the lumen. As the cavity expands, water can be slowly sucked into the jellyfish's body; When the cavity shrinks, the opposite happens, and water is expelled from the jellyfish's body. At this time, jellyfish can use the thrust generated by the water flow to move.
In addition, jellyfish may use their tentacles, or tentacles, when they change direction. When they want to fire in one direction, their tentacles bend in the opposite direction. It should also be noted that jellyfish are not particularly good swimmers, so they often need to use wind or water to move their bodies in the process of their movement, which can make them use less effort.
