Question

VI. Установіть послідовність етапів життєвого циклу бичачого ціп'яка: А. У м'язах личинка росте і перетворюється на фіну. Б. Яйце разом з травою ковтає велика рогата худоба. В. Через стінки кишечнику личинка потрапляє у кров, а потім у м'язи корови. Г. Із яйця виходить маленька личинка, озброєна гачками. Д. Людина з'їдає недостатньо просмажене заражене м'ясо великої рогатої худоби.ОЧЕНЬ СРОЧНО, ДАМ 30 БАЛОВ.​

Answer 1

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Answer 2

The Life Cycle Stages of a Beef Tapeworm

The life cycle of a beef tapeworm (Taenia saginata) involves several stages. Here is the sequence of events:

A. The life cycle begins with the ingestion of eggs by humans. These eggs are usually present in undercooked or raw beef from infected cattle. When a person consumes contaminated meat, the eggs are released in the digestive system.

B. Once inside the human digestive system, the eggs hatch, releasing larvae called oncospheres. These oncospheres then penetrate the intestinal wall and enter the bloodstream.

C. From the bloodstream, the oncospheres migrate to various organs, but they primarily target the muscles. In the muscles, the oncospheres develop into cysticerci, which are fluid-filled sacs containing the larvae.

D. The cysticerci can remain in the muscles for several months or even years, depending on the individual. During this time, they continue to grow and develop.

E. When an infected human is consumed by a definitive host, which is typically a carnivorous animal such as a dog or a bear, the life cycle of the beef tapeworm continues. The definitive host can become infected by consuming the infected meat of the intermediate host (the human).

F. Once inside the definitive host's digestive system, the cysticerci are digested, releasing the adult tapeworm. The tapeworm attaches itself to the intestinal wall of the definitive host and begins producing eggs.

G. The adult tapeworm can grow up to several meters in length and can produce thousands of eggs, which are then passed out of the host's body through feces.

H. The eggs are then ingested by cattle, completing the life cycle. The eggs hatch in the cow's digestive system, and the oncospheres penetrate the intestinal wall, migrate to the muscles, and develop into cysticerci. The cycle continues when humans consume the infected meat.

Please note that the information provided above is based on general knowledge about the life cycle of beef tapeworms. For specific details and scientific studies, it is recommended to consult authoritative sources in the field of parasitology.