Online Biology Notes for students
Lab diagnosis of Ascaris lumbricoides a. Detection of Parasite Adult Worm In the case of heavy infection, the adult worm is possible to find in stool or sputum of the patient by the naked eye. Barium meal may reveal the presence of an adult worm in the small intestine. A plain abdominal …
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Life cycle of Ascaris lumbricoides In the life cycle of Ascaris, there is no secondary host. The life cycle of Ascaris is monogenetic as it involves only one host i.e. Man. Figure: Life cycle of Ascaris lumbricoides. Image Source: CDC. 1. Egg in feces The sexually mature female produces as many as …
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Reproductive system of Ascaris lumbricoides Only sexual reproduction occurs in Ascaris. Sexes are separate i.e., dioecious in Ascaris and these roundworms also show distinct sexual dimorphism. Males are smaller than the females and they also have a curved tail with pre and post anal papillae, cloaca, and a pair of spicules or …
Digestive System of Ascaris lumbricoides I) Alimentary canal: It is a straight and complete tube that starts with the mouth at the anterior end and ends with the anus at the posterior end. It comprises a short pharynx or esophagus representing foregut, along intestine or mid-gut, and short rectum or hindgut. Figure: …
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Habitat of Ascaris lumbricoides Ascaris lumbricoides are the largest most familiar endoparasites of the man freely living in the lumen. It has also been reported from animals like pigs, cattle, sheep, and squirrels. It inhabits the small intestine of more frequently children than adults. It is cosmopolitan in distribution. Sometimes, it migrates …
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