The worm body is often covered with ridges, rings, bristles, or other distinctive structures. The radially symmetrical head of a nematode also has distinct features. The head is covered with sensory bristles and, in many cases, solid "head-shields" around the mouth region. 1 июн. 2020 г.
Do roundworms have a head and tail?
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.
Can worms enter head?
If the larval worm enters the nervous system, including the brain, it can result in a condition known as neurocysticercosis. Infection of this kind can often cause epilepsy once inside the brain.
Can you feel roundworms?
If you have a roundworm infection of your intestines (ascariasis), you may not have symptoms. You may see live worms in your poop though. If you do have symptoms, they may include: Cough.
What are three characteristics of roundworms?
SummaryRoundworms make up the phylum Nematoda.Roundworms have a pseudocoelom and hydrostatic skeleton. Their body is covered with tough cuticle.Free-living roundworms are found mainly in freshwater habitats.Parasitic roundworms have a variety of hosts, including humans.11.7: Roundworms - Biology LibreTexts
