Flukes are leaf-shaped , ranging in length from a few millimeters to 7 to 8 cm. The tegument is morphologically and physiologically complex. Flukes possess an oral sucker around the mouth and a ventral sucker or acetabulum that can be used to adhere to host tissues. A body cavity is lacking.
Which of the following are characteristics of flukes quizlet?
Which of the following are characteristics of flukes? They take in food through their mouths. Their life cycle usually involves two or more hosts. Their life cycle almost always involves a snail host .
Which of the following are characteristics of flukes?
The symmetrical body of a fluke is covered with a noncellular cuticle. Most are flattened and leaflike or ribbonlike , although some are stout and circular in cross section. Muscular suckers on the ventral (bottom) surface, hooks, and spines are used for attachment.
What is the function of flukes?
Flukes have suckers and hooks to anchor themselves to the host and their body surface is covered by a protective cuticle. The whole life cycle may either occur within one host or require one or more intermediate hosts to transmit the infective eggs or larvae (see cercaria; miracidium).
How do you know if you have flukes?
Symptoms of Fluke Liver Infections
At first, liver flukes may cause no symptoms, or depending on the type and severity of the infection, they may cause fever, chills, abdominal pain, liver enlargement, nausea, vomiting, and hives . Fasciola flukes are more likely to cause these symptoms.
What is the life cycle of flukes?
Life Cycle:
The adult flukes deposit fully developed eggs that are passed in the feces . After ingestion by a suitable snail (first intermediate host) , the eggs release miracidia , which undergo in the snail several developmental stages (sporocysts , rediae , cercariae ).
Where do flukes live in humans?
Few flukes (Fasciola hepatica) live on the gills, skin, or outside of their hosts , while others, like blood flukes (Schistosoma), live inside their hosts. Humans are infected by Fasciola hepatica when raw or improperly cooked food is ingested.
What is the another name for trematodes?
Trematodes, also called flukes , cause various clinical infections in humans. The parasites are so named because of their conspicuous suckers, the organs of attachment (trematos means “pierced with holes”). All the flukes that cause infections in humans belong to the group of digenetic trematodes.
Which of these are characteristics of all three main groups of worms?
All of them are invertebrates. They all have long, narrow bodies without legs . All worms also have tissues, organs, and organ systems. Worms have bilateral symmetry.
Which of the following organisms are gastropods quizlet?
Which of the following organisms are gastropods? Nudibranchs, slugs, and snails .
What are characteristics of trematodes?
Trematodes are flattened oval or worm-like animals, usually no more than a few centimetres in length, although species as small as 1 millimetre (0.039 in) are known. Their most distinctive external feature is the presence of two suckers, one close to the mouth, and the other on the underside of the animal .
What are the characteristics of liver fluke?
- abdominal pain.
- fever.
- nausea.
- vomiting.
- diarrhea.
- hives.
- malaise.
- decreased appetite and weight loss.
Why do flukes produce so many eggs?
Several thousand species of flukes have been described; all are parasites. ... Because of the small chance of transmission of parasite stages from host to host, internal parasites put much energy into reproduction , producing many, many eggs and/or larvae because so few ever reach the next host in the life cycle.
How do humans get blood flukes?
Blood flukes, or schistosomes, are parasitic flatworms that can live inside people for decades, and they make a rather gruesome journey to get there — after hatching in water contaminated by feces , the parasites hitch a ride into the human body on a tiny snail host that burrows through skin.
What is a human infection caused by flukes called?
What is fascioliasis ? Fascioliasis is an infectious disease caused by Fasciola parasites, which are flat worms referred to as liver flukes. The adult (mature) flukes are found in the bile ducts and liver of infected people and animals, such as sheep and cattle.
What are the symptoms of parasites in humans?
- Abdominal pain.
- Diarrhea.
- Nausea or vomiting.
- Gas or bloating.
- Dysentery (loose stools containing blood and mucus)
- Rash or itching around the rectum or vulva.
- Stomach pain or tenderness.
- Feeling tired.
