Free-living flatworms usually use two ways of locomotion together. Cilia on their epidermal cells help them glide through the water and over the bottom. Muscle cells controlled by the nervous system allow them to twist and turn so that they are able to react to environmental conditions rapidly.
Some parasitic flatworms may move with cilia and muscles, some do not move at all.
The muscles in roundworms run in strips down the length of their body walls. Aquatic roundworms contact these muscles to move like snakes through the water. Soil-dwelling roundworms simply push their way through the soil by thrashing around.
No comments:
Post a Comment