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Question
The secondary or intermediate host of Taenia is
The secondary or intermediate host of Taenia is
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Solution
The correct option is A Pig
- Pigs ingest the eggs from human faeces or vegetation contaminated with human excreta. The embryonated eggs enter the intestine where they hatch into motile oncospheres. The embryonic and basement membranes are removed by the host's digestive enzymes (particularly pepsin).
- Then the free oncospheres get attached to the intestinal wall using their hooks. With the help of digestive enzymes from the penetration glands, they penetrate the intestinal mucosa to enter the blood and lymphatic vessels. They move along the general circulatory system to various organs, and large numbers are cleared in the liver.
- The surviving oncospheres preferentially migrate to striated muscles, as well as the brain, liver, and other tissues, where they settle to form cysts called as cysticerci. A single cysticercus is spherical, measuring 1–2 cm in diameter, and contains an invaginated protoscolex.
- The central space is filled with fluid like a bladder, hence it is also called bladder worm. Cysticerci are usually formed within 70 days and may continue to grow for a year.
So, the correct answer is option A.
- Pigs ingest the eggs from human faeces or vegetation contaminated with human excreta. The embryonated eggs enter the intestine where they hatch into motile oncospheres. The embryonic and basement membranes are removed by the host's digestive enzymes (particularly pepsin).
- Then the free oncospheres get attached to the intestinal wall using their hooks. With the help of digestive enzymes from the penetration glands, they penetrate the intestinal mucosa to enter the blood and lymphatic vessels. They move along the general circulatory system to various organs, and large numbers are cleared in the liver.
- The surviving oncospheres preferentially migrate to striated muscles, as well as the brain, liver, and other tissues, where they settle to form cysts called as cysticerci. A single cysticercus is spherical, measuring 1–2 cm in diameter, and contains an invaginated protoscolex.
- The central space is filled with fluid like a bladder, hence it is also called bladder worm. Cysticerci are usually formed within 70 days and may continue to grow for a year.
So, the correct answer is option A.
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