The cuticle is fairly rigid and limits the volume of the worm. This allows the build up of hydrostatic pressure from fluid accumulated in the worm and contributes to what is called a hydrostatic skeleton. The force of the hydrostatic pressure allows the worm to maintain its cylindrical shape. 11 дек. 2015 г.
Why do roundworms have a round body shape?
Structure and Function of Roundworms Roundworms range in length from less than 1 millimeter to over 7 meters (23 feet) in length. As their name suggests, they have a round body. This is because they have a pseudocoelom. This is one way they differ from flatworms.
What is the characteristics of roundworms?
Roundworms (nematodes) are bilaterally symmetrical, worm-like organisms that are surrounded by a strong, flexible noncellular layer called a cuticle. Their body plan is simple. The cuticle is secreted by and covers a layer of epidermal cells.
Do roundworms have long slender round bodies?
Roundworms have cylindrical bodies. Some are carnivores, some are herbivores, and some are parasites. Unlike flatworms or cnidarians, roundworms have a tube-like digestive system that has two openings.
Do roundworms have bilateral symmetry?
Worms are invertebrate animals with bilateral symmetry. Worms have a definite anterior (head) end and a posterior (tail) end. The ventral surface of worms and other organisms is the bottom side of the body, often closest to the ground. The dorsal surface is located on the upper part of the body facing the sky.
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