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Life cycle of the roundworm — the Cycle of development of human roundworm

Or the nematode Ascaris is a multicellular organism, a parasitic round worm. Is an important component of the ecosystem. Species adapted to life in water, it does not matter: it is fresh or saltwater and in the soil. Having the ability to survive at a certain temperature, binding moisture and oxygen, they can be stored in the form of eggs and larvae. And the development cycle of a roundworm human is directly related to the new ruler.

ZHiznennyj cikl askaridy — Cikl razvitiya chelovecheskoj askaridy

The life cycle of a roundworm is a parasitic mode of existence and impact on other flora and fauna as well as human. This interaction leads to diseases like Nematodes, Ascariasis. Striking plants, lead to their death, and that animals roundworm coexist peacefully. People suffering from parasites most. They cause him not only the inflammatory processes on the background of presence of a foreign body inside, but also help to lose an important vital systems.

What is Ascaris human

Differs from other representatives of nematodes and helminths. Once in the body, human life cycle of ascarids takes place exclusively inside. It can change its habitat, but the carrier, master, it does not change. Therefore, man is the first and last link, which is involved in the process of life, and the place where the development of the helminth. Before the advent in the human body the seeds of future worms live in a supportive environment 10-12 years.

How to describe these representatives of roundworms? Let's start with the most simple. Individuals are of different sexes: males and females. Their length is respectively from 20 to 40 cm in females and from 15 to 25 cm in males. It got its name for the folded piece on the end of his body. Mostly parasitic in the walls of the small intestine. But sometimes move around the body. But will talk about it later. Motion roundworm human chaotic. It has no means of fixing or characteristic suckers. Mostly responds to the arrival of food debris and moving toward them.

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Outside has a so-called "hypodermis". It consists of 10 flexible protective layers. They protect it from exposure to digestive juice, the mechanical action of the cells and antibodies, as well as many poisonous toxins that, one way or another, fall into the human body. Inside the human roundworm are the longitudinal muscles. Underdeveloped senses are limited to only special small papillomas in the field of a kind of the mouth. The nerve endings are presented in the form of a ring near the pharynx, from which along the body line visible stem nerves.

As the human roundworm heterosexual, you look at their structure:

male. Has the testis and the VAS deferens. At the end of the body is the gut, where face and genitals. Another feature of the representative is that he has one end curved in the direction of the abdominal cavity,
female. The structure of the reproductive system is quite unusual. 2 the ovary, multiple uterine that fall in the unpaired vagina. And all that variety of bodies located in the ventral side of the body.

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Daily oviposition, about 24 thousand, occurs in the human intestine. They are also protected, but 5 layers. Impact on they may be ultraviolet radiation, alcohol, benzene and hot water. They are resistant to temperature fluctuations.

The development of the human roundworm

Before proceeding to the stages of life, we consider in detail the main stages and the developmental cycle of the human roundworm. Of course, start with the fact that eggs get into the soil. This occurs by the excretion of feces from the intestine of man.

A month later formed future round worms as larvae. They fall on the plants, flowers and vegetables in underground water table and from water supply and household wells. That is why it is strictly forbidden to use unboiled tap water. Inside the human body or penetrate through the skin in contact with the ground, or in the use of raw foods from the garden.

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Having risen through the stomach directly into the intestine, the larvae do not dwell on it. With its unusual mouth, they make microscopic little holes in the wall, get into the circulatory system. Due to the movement of the vessels blood, the future of the human roundworm penetratebronchi, throat.

Previous stages of development roundworm repeat again toward the intestine. From the oral cavity with saliva their way again to the stomach. After the final contact with the small intestine, the worms begin to grow and Mature. This process is not takes place until the stage of Mature individuals, round worm.

Cycle of roundworm human

While the larvae did not reach its master, man, they're totally harmless. As soon as they enter for the first time in the small intestine, begins the first cycle, the stage of development of the microflora in the human roundworm – stage gradual migration. It is here that their enzymes larva released from the egg, dissolving it, and reaches a size of 0.2 mm.

Start the movement by the authorities. Next step – migrate to the liver, bile ducts, rarely the pancreatic gland. The result is a disruption in the gastrointestinal tract with subsequent unpleasant painful symptoms:

  • retching, nausea,
  • the lack of desire of food intake,
  • diarrhea with the characteristic of integrity of the intestinal walls bleeding,
  • sudden weight loss,
  • Allergy, redness, itching,
  • lethargy, fatigue and weakness.

The consequences of the occurrence of parasites in the intestine lead to diseases like appendicitis, obstruction, pancreatitis, dysbacteriosis.

If aspirated into the lungs, the worms cause coughing, shortness of breath, pneumonia and acute bronchitis, fever, asthma. A major consequence could be a suffocation.

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If they fall through the blood to the heart, usually choose the the right ventricle of the organ. Naturally, the consequences of this combination become heart attacks, coronary artery disease and hemorrhage.

Possible development of human roundworm

But the Ascaris full life cycle and stages can change. As they move throughout the body, can reach and brain. Here, the processes may be irreversible:

  • migraines. Starts from the moment when the larvae fall into the outer shell of the brain,
  • epileptic seizures, convulsions. Parasites gradually penetrate into the medulla,
  • dizziness, loss of consciousness,
  • causeless nervousness, depression.
ZHiznennyj cikl askaridy — Cikl razvitiya chelovecheskoj askaridy

Often confused with tumors of the brain. But that's not all what a human roundworm. With the same ease they reach the visual and the auditory nerve, leading to blurred vision, temporary deafness or partial hearing loss. And when they start to parasitize through the hole of the skull to the brain can even be fatal.