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Which of the systems is absent in tapeworms. Why do tapeworms lack digestive organs?

Features of the structure of tapeworms the digestive system is absent, food is absorbed by the entire surface of the body
Large tapeworms exist singly in the host's body, so they reproduce with their own segments. Why do tapeworms lack digestive organs?

Why do tapeworms lack digestive organs?

Tapeworms:
class representatives and characteristic ⇩. And among free worms there are representatives who have developed organs of vision (pigments that react to light) and balance.
Biology. 14 Jul 11:
26. Why do tapeworms lack digestive organs?

Because of this, a reduction in the digestive system occurred in the class of tapeworms, that is, the digestive organs completely lost their significance. Why is it better to register?

ask your question.
Tapeworms do not lack digestive organs. Why are worms and snakes different types?

Where and how are worms cooked for lunch?

Why dream of pulling out a piece of worms from your finger one by one?

Detailed solution paragraph 7 in biology for students in grade 7, authors V. V. Latyushin, V. A. Shapkin 2014

Gdz diagnostic work in Biology for grade 7 can be found here

Why are flatworms so named?

Flatworms got their name because of the specific shape of the body.

Which flatworms are dangerous to humans?

For humans, bovine tapeworm, echinococcus, pork tapeworm are dangerous.

Questions

1. What are the differences between flatworms and coelenterates?

Flatworms, unlike coelenterates, have bilateral body symmetry. Their body is made up of several layers. Organs appeared.

2. What features of the structure and life make it possible to divide the type of flatworms into classes?

Dividing the type of flatworms into classes allows the features of the external structure of the body, specific features of the internal structure, different development cycles and habitats.

3. Why do tapeworms lack digestive organs?

Prevention of helminthiases are the following measures:

Compliance with the rules of personal hygiene (washing hands before eating)

Using only quality food

Sufficient heat treatment of meat.

5. Flatworm larvae are able to move independently. What does it matter?

The mobility of the larvae facilitates the rapid search for an intermediate host.

Tasks

Using various sources of information, prepare a report on modern achievements in helminthology.

Applied problems cover: a detailed study of all pathological and morphological and pathological and physiological processes associated with the infection of humans, useful animals and plants with various helminths, in order to find the most effective methods for diagnosing, preventing and treating diseases caused by them, Main sections of Helminthology: General Helminthology (study of Helminthology, fauna , morphology, taxonomy, biological cycles and physiology of helminths); medical Helminthology (human helminthiases, measures to combat them); Veterinary Helminthology (helminthiases of domestic and game animals, measures to combat them); agronomic Helminthology, or phytohelminthology (the study of the effect of helminths on a plant, the development of measures to combat phytohelminths).

Comments

Megan92 () 2 weeks ago

Daria () 2 weeks ago

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Megan92 () 13 days ago

Daria () 12 days ago

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Guest A week ago

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Alexandra (Syktyvkar) 5 days ago

Varieties of tapeworms and their characteristics

Tapeworms in humans are divided into the following types:

Among women: pain and inflammation of the ovaries. Fibroma, myoma, fibrocystic mastopathy, inflammation of the adrenal glands, bladder and kidneys develop. As well as heart disease and cancer.

Echinococcus

There are a huge number of representatives of the class of tapeworms, however, the above types of worms are the most common.

What diseases are caused by tapeworms?

List of the most common diseases provoked by worms:

You can get infected by drinking unwashed water, poorly washed vegetables and fruits, and by contacting the oral cavity with unwashed hands.

Life cycle of the pygmy tapeworm

Symptoms of a tapeworm infection

With any type of infection with helminths, in humans, the symptoms are basically the same.

fatigue, sudden mood swings;
violation of sleep and nutrition;
itching in the anus;
allergic reactions on the skin, rashes;
a sharp decrease in body weight.

At certain stages of maturation of helminth eggs, signs of infection become more pronounced. To the above symptoms are added vomiting, severe muscle pain and fever. The characteristic severity of symptoms depends on the general condition of the body and the type of worms. In some cases, there may be coughing fits, rapid breathing, stomach pain.

From whom:

For the last few years I have felt very bad. Constant fatigue, insomnia, some kind of apathy, laziness, frequent headaches. I also had problems with digestion, bad breath in the morning.

And here is my story

All this began to accumulate and I realized that I was moving in some wrong direction. I began to lead a healthy lifestyle, eat right, but this did not affect my well-being. The doctors couldn't say much either. It seems like everything is normal, but I feel that my body is not healthy.

A couple of weeks later, I came across an article on the Internet. literally changed my life. I did everything as it is written there and after a few days, I felt significant improvements in my body. I began to get enough sleep much faster, the energy that I had in my youth appeared. The head no longer hurts, there was clarity in the mind, the brain began to work much better. Digestion has improved, despite the fact that I now eat haphazardly. I passed the tests and made sure that no one else lives in me!

Diagnosis of invasion

To diagnose a disease caused by intestinal worms, medical institutions conduct a scatological study of the material obtained from the patient. For the most accurate results, it is recommended to take tests within an hour after emptying.

How to get rid of a tapeworm:

How to get rid of tapeworms? To do this, it is necessary to select a separate preparation for each type of helminthic invasion. Only the attending physician can prescribe a course of treatment and prescribe medications. Self-medication is strictly prohibited.

After removing worms from the human body, it is definitely recommended to spend some time under the supervision of a doctor in the clinic. Maintaining the effect of the therapy is prolonged with the help of special means and the appointment of the right diet.

In folk medicine, there are a variety of drugs in the form of decoctions that help get rid of worms. Such tinctures and decoctions can be prepared from lime ash, celandine flowers, bitter wormwood, garlic and other means, but only a doctor will tell you how to get rid of tapeworms. However, before proceeding with the treatment of folk methods, you should consult a specialist. But, as a rule, in practice, such means are ineffective.

Preventive measures

The doctor will tell you how to get rid of tapeworms, a long course of treatment can be avoided only if you follow elementary preventive measures:

all types of meat and fish must be thoroughly cooked;
use exclusively boiled water, it is strictly forbidden to drink raw water;
wash hands with antibacterial soap before and after eating;
swimming in untested rivers and reservoirs is not recommended;
wash vegetables and fruits well;
1-2 times a year to carry out diagnostics in the clinic for the presence of helminthic invasion.

If you still think that getting rid of worms is very difficult, then we recommend that you follow simple rules of prevention. At the slightest symptoms of infection with worms, you need to undergo an examination in the clinic. After all, it is much easier to start treatment in the early stages than in advanced cases. The sooner you see a doctor, the more likely you are to stay healthy.

The body of the worms is like a ribbon. In the vast majority of species, a head is distinguished in it ( scolex), neck and strobila, consisting of many individual segments ( proglottid). The body length of tapeworms and the number of segments vary greatly from species to species. So, echinococci have only a few segments, while a bull tapeworm can have more than a thousand of them. In addition, the number of segments depends on the age of the worm, the abundance or lack of food. Body length from less than a centimeter to almost 20 meters. There are types of tapeworms that do not have a segmented body structure.

The formation of new segments occurs in the region of the neck, i.e., here is the growth zone of the worm. Toward the posterior end of the tapeworm are the most mature proglottids filled with eggs. The end segments are gradually separated from the body and go out, usually with feces.

Tapeworms, like all flatworms, are characterized by skin-muscle sac(transverse, longitudinal, spino-abdominal muscles grow together with integuments), filled parenchyma body cavity, protonephridia(organs of excretion), the absence of respiratory organs, the nervous system, consisting of head ganglia and longitudinal cords extending from them.

In each segment, as it moves away from the neck, its own hermaphroditic reproductive system(with the exception of species with an undivided body, they have only one "kit"). Moreover, the male part of it develops first, then the female part is added.

The female part of the reproductive system The tapeworm consists of the ovary, oviduct, vitelline glands, Melis's body, uterus, vagina, seminal receptacle.

The male part of the reproductive system tapeworm consists of numerous testes and vas deferens, vas deferens, ejaculatory canal with a copulatory organ.

The vagina and the ejaculatory canal open into the genital cloaca of the segment, which is a depression in the body of the worm.

After fertilization, the zygote is surrounded by yolk cells (from the yolk cells) and the shell (from the Melis body). The resulting egg is then transferred to the uterus. In some species, the uterus opens outward, in others it is closed. In the first case, the eggs gradually leave the uterus, in the second they accumulate in it, as a result of which the uterus increases, many branches develop in it. The number of eggs in a mature segment can reach several thousand. With the exception of the uterus, the rest of the reproductive system is reduced.

Life cycle of tapeworms

In the uterus of the segment in the egg, a larva is formed oncosphere. It has a round shape with six chitin hooks.

When an egg enters the digestive system of an intermediate host (for example, a cow or a pig), the oncosphere leaves the shell, penetrates the intestinal wall and through it enters the bloodstream, which spreads the larvae throughout the body. Oncospheres settle in various tissues (most often in muscles) and turn into the second larval stage of tapeworms, which is called Finnish.

In the simplest case, the Finn is a vial of liquid, the wall of which is concave inwards in one place. In this recess, the head of the future tapeworm develops. Such a Finn is called a cysticercus. Other types of Finns may have many head invaginations or contain blisters of the next order with heads. Finns are usually quite large, ranging in size from a grain of rice to a walnut.

Question 1. List the differences between flatworms and intestinal animals.

First, unlike coelenterates, which have radial symmetry, flatworms have bilateral symmetry.

Secondly, coelenterates are two-layer animals that do not have internal organs. The body of flatworms is made up of many layers of cells. Inside the musculocutaneous sac there are internal organs united into organ systems: digestive, excretory, nervous and sexual. The space between these organs is filled with cells, so there is no internal cavity.

Question 2. What features of the structure and lifestyle make it possible to divide the type of flatworms into classes?

Flukes class. The body shape of flukes is most often leaf-shaped. Worms of this class lead an exclusively parasitic way of life. In this regard, they have special organs of attachment to the body of the host - suckers. Flukes are characterized by development with alternation of generations.

Question 3. Why do tapeworms lack digestive organs?

7. Type Flatworms. Classes: Eyelash, Flukes, Band

1.4 (27.62%) 42 votes

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