Parasitism is called this form of relationship, when some of the organisms (the parasite) other (amos) as a source of food, temporary or permanent, in the habitat. The owner applies to a particular damage, parasites depend on it during the development stage. The set of all stages bears the name of life cycle.
The form of the existence of parasites are extremely varied. Distinguish true, false, form, as well as the optional protocol and obligate parasitism. Parasitology is primarily dedicated to the study of the phenomenon of true parasitism.
False parasites when ingested by the teacher of the middle violate their livelihoods, but of their cycle of activity of short duration. Examples of false ways: the leeches in the throat and in the nose of the person. This may be the cause of the death of media due to obstruction of the airways.
In the classification of the forms are:
Distinguish the parasitism of a contact time. Temporary parasites used by the owner only on the quality of the food. Example: suck blood, enter parts of the arthropods.
Permanent parasites are classified into the following types:
How is the life cycle of the parasites? The function of the stages of development of the following:
The owner is called intermediate, unless you live in it the larvae of the parasite or exert the function of asexual reproduction. In this case, he is the source of the infection permanent of the masters. Another meaning in the link – the cycle includes the phase of settlement. Sometimes intermediate medium provides the need for the development and the survival of the cause of the disappearance at the time of the end of the masters.
When the development cycle of the microorganism, passes with change of two or three intermediate owners, the first of them bears the name of 1 intermediate, the second is optional.
In short, the host produces the cycle of growth and reproduction sexually Mature stage of the organism. At the end of the unit, a parasite is introduced through an intermediary or through direct contact.
Tank parasitism allows us to penetrate into the body of the final master. In the reservoir of the causal agent can exist for a long time, build up and resettle to the environment in the territory.
Conqueror-the master allows you to eat ectoparasites. As they feed on the parasites? They are there only for the food. For example, the bed bugs, that feed on the blood of humans. Another example of the clamp.
The life cycle of infecting microorganisms can be divided into two large groups:
In a simple group of cycles pass without a change. These agencies refer dysenteric ameba, Ascaris, vlasoglav, and others.
A sophisticated group includes several intermediates. Can be vertebrate animals, including parasitic the body passes through several stages of development or multiplied. Examples: eggs of the helminth are transferred to the flies to the food, or cockroaches.
Part-infecting organisms has a little specificity. Are the wild beasts, the domestic animals, but can be established and in the man. These representatives are wolfarth fly, liver fluke, the choice of lentets. The cause of the infection in humans in these examples are converted in animals. Diseases caused by these pathogens are called zoonotic.
As are organisms that live as a parasite of the media? Pathogens pioneer heritage in the digestive tract, distinguished from eggs or larvae in the stool. The knowledge of methods to extract helps to determine the exact diagnosis of the excitation.
If you compare it with the species that live freely, and parasites, the life cycles of the past is much more difficult. Free species without job to deal with the problems of reproduction and resettlement, and parasites of organisms that develop complex stages. They have a lot of larvae cycles, there are housing in different environments, performing different functions. It has functions of resettlement, of rapid growth, of passive waiting, of the calf.