Life cycle of ascaris lumbricoides
Ascaris lumbricoides passes it's life cycle in only one host. No intermediate host is required.
Man is only definitive host.
Human ingested infective fertilized egg, larvae of ascaris lumbricoides through contaminated food or water.
In human duodenum larvae is released from egg.
Larvae become young and very active.
Young larvae make hole in mucus membrane of small intestine.
From small intestine, young larvae enters in portal circulation to reach liver, then parasite enters in right side of heart through circulation.
After that from heart, larvae enters in pulmonary circulation where they grow in size.
From pulmonary circulation, larva reaches lung alveoli then enters in trachea.
From trachea parasite is pushed in larynx.
From larynx, parasites jump and are swallowed in pharynx.
In end, it enters in small intestine, as result larvae is converted into adult male and female worm and fertilization occurs.
Female worm discharges egg in stool, egg mature in soil, then again life cycle repeated on.
Human ingest infective egg of ascaris lumbricoides contaminated food and water.
In duodenum of human larvae is released from egg.
Young larvae penetrates mucus membrane of small intestine.
From small intestine larvae enters portal circulation to reach liver.
From liver parasite enter right side of heart through circulation.
From heart larvae enter in pulmonary circulation, grow in size twice.
From pulmonary circulation (young larvae reaches lung, alveoli, bronchi, trachea.
From trachea larvae pushes in larynx then pharynx.
Larva swallowed and reach intestine.
Larva convert into adult male and female worm.
Female worm discharging egg in stool, feces.
Develop in soil.
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