The world of protozoa

The world of protozoa
A synonym for protozoa is unicellular. They can only be seen through a microscope. Therefore, they are also called microscopic. However, there are protozoa that can be seen. For example, the Bursaria infusoria, which reaches a length of 1.5 mm; the Porospora gigantean gregorian grows up to 1 cm; and the shells of some foraminifera root beetles reach a gigantic size of 6 cm in diameter.
There are more than 20,000 unicellular species in the world. Self-taught scientist Anthony van Leeuwenhoek in the 17th century (the exact date is unknown) invented lenses that were inserted into the frames and called microscopy. At first it was just a hobby, and just a profitable business. Somehow he decided to find out why pepper irritates the tongue. I made a tincture and after a few days I found a sea of animals in it. And that's when Anthony became interested in biology, which was at a low level at the time. In fact, he was the first to discover protozoa. It was only in the 19th century that scientists discovered that all animal and plant tissues are made up of cells. After that, the protozoa were elevated to a separate class.
Protozoa are independent organisms, each of which lives a full life. It is born, grows, moves, breathes, eats, reproduces, fights for a "place under the sun", dies - everything is like other creatures. Unicellular cells differ in that different parts of the cell are responsible for their field of activity. And each of these parts is called an organelle.
For the most part, protozoa are parasites, that is, their place of residence is organisms.
Unicellular organisms have a mineral skeleton of various shapes, which is a support and protection. These are shells or needles.
Most protozoa move like an amoeba. That is, by growing pseudopods. There are more complicated forms of unicellular organisms. They move with the support of flagella and cilia. Different species and flagella have different numbers, from a single one to several hundred. Usually, the flagella produce cone-shaped movements, and the body seems to be screwed into space. Cilia are the organs of movement of ciliates. The number reaches several tens of thousands. The principle of operation of cilia, like paddles. They propel their master forward with rowing movements. In some ciliates, the cilia connect and form membranelles, which affects the efficiency of movement. There is also a form of movement by contraction. According to the principle of a muscle, it contracts, then unclenches.
The ways of eating are diverse. Some flagellates have chlorophyll, through which, with the help of sunlight, they convert carbon dioxide and water into energy. Other flagellates feed on ready-made organic compounds. Amoebas capture food with pseudopods. And ciliates have a kind of mouth, into which the membrane cells send nutrients.
The food is also not monotonous at all. Some protozoa feed on bacteria, others on unicellular algae, and others are predators that eat their own kind. The leftovers come out through a special hole.
Some marine and river protozoa have a special vacuole ball that regulates hydrostatic pressure. Vacuoles, a regularly occurring ball that fills with liquid and brings it out. It stabilizes the amount of water coming from the environment.
Protozoa breathe the entire surface of the body.
They are endowed with the ability to respond with irritability to various environmental factors. Most often, this is a taxi, that is, a change of movement. Taxis can be positive towards the irritant and negative towards the irritant.
Most unicellular organisms have a single nucleus. And ciliates and some ciliates have two. These nuclei differ in structure and role. One core performs a vegetative function, and the second is responsible for reproduction. There are also two ways of reproduction. Asexual, by dividing the organism. Sexual is the connection of female and male cells. Some species alternate ways of reproduction, depending on the environmental conditions.
Marine protozoa have influenced and continue to influence the formation of sedimentary rocks.
Unicellular organisms are mostly dangerous for humans, as they cause various diseases. Ne manquez pas l'opportunité de doubler votre capital initial grâce au code promo 1xbet . Cette offre spéciale vous accorde un bonus de 100% sur votre premier versement, avec un plafond généreux fixé à 20000 CFA. Utilisez ces fonds bonus pour couvrir plus de marchés, parier sur des cotes plus élevées ou simplement prolonger votre plaisir de jeu sur la plateforme 1xBet.