Why Does an Amoeba That Lives in Freshwater Has a Contractile Vacuole

If a brine amoeba is added to fresh water and it is not a cyst at that time, its contractile vacuole bursts (play, 1). Indeed, the task of the vacuole is to create an isotonic solution for the environment of the amoeba. If the concentration of salt in the vacuole is too high, it triggers water absorption. (Thu, 1). Soon, the vacuole will burst before reaching equilibrium. This means that the amoeba will also burst. See Figure 4 (thu, 1). Paramecium and Amoeba have large contractile vacuoles (average diameters of 13 and 45 μm, respectively), which are relatively comfortable to isolate, handle and study. Chlamydomonas, with a diameter of 1.5 μm, includes the smallest known contractile vacuoles. In Paramecium, which has one of the most complex contractile vacuoles, the vacuole is surrounded by several channels that absorb water from the cytoplasm by osmosis. Once the channels have filled with water, the water is pumped into the vacuole. When the vacuole is full, it expels water through a pore of the cytoplasm that can be opened and closed.

[2] Other protists, such as Amoeba, have CVs that move to the surface of the cell when they are full and undergo exocytosis. In amoebae, contractile vacuoles collect excretory waste such as ammonia from the intracellular fluid by diffusion and active transport. Ectoplasm is the outer gel of the amoeba and endoplasm is the internal fluid. These two components are used to store organelles and undergo pseudopodial expansion (see page seven, pseudopodial motion); Locomotion of the amoeba and capture of food. See Figure 2 (Aardvark Catalyst, 163-164). The two vacuoles are the digestive and food vacuoles. Food vacuum is formed when the amoeba carries out the process of phagocytosis (pseudopod surrounding the food [Gale, 1]) (see Figure 3) (catalyst aardvark, 163). Once the food vacuole is formed, it becomes a digestive vacuole responsible for breaking down food into energy (Encyclopedia of Science, 1). In addition, an amoeba has a contractile vacuole, which is responsible for pumping water in and out of the amoeba. Amoebae are diverse in many ways. For example, they significantly reach the size of 1 mm (Blake, 1). Some traits even change in different environments, making it difficult to distinguish between amoebae (Blake, 1).

In addition, some amoebae are carnivorous, others herbivores and others even omnivorous. Then there are the parasites (Blake, 1) that can live in the liver, lungs, brain – even the heart (Innvista, 1)! These become a cyst until they enter you, then they become a trophocite, their forms replicating (1). The contractile vacuole is a special type of vacuole that regulates the amount of water in a cell. In freshwater environments, the concentration of solutes is hypotonic, lower outside the cell than in the cell. Under these conditions, osmosis causes the accumulation of water from the external environment in the cell. The contractile vacuole acts as part of a protective mechanism that prevents the cell from absorbing too much water and possibly lysing (tearing) due to excessive internal pressure. The CV does not exist in higher organisms, but some of its unique properties are used by the former in their own scorerulation mechanisms. CV research can therefore help us understand how osmoregulation works in all species. Many questions about the CV remain unresolved from 2010: in unfavorable, incongruous or unsuitable environments, an amoeba can turn into a cyst (Galileo, 1). This “enzyse” occurs to keep the amoeba alive until it reaches a preferred area. Then the organism will secrete a special membrane.

This membrane is called the cyst membrane and surrounds it completely (Galileo, 1). In addition, the amoeba becomes spherical and loses a huge amount of amoeba water (Galileo, 1). An unfavorable environment can mean an environment that is too hot, cold or salty for the amoeba. Cysts have a function very similar to that of bacterial spores (Salyers/Dixie, 1). Both are defense mechanisms that help organisms survive. In some unfavorable places where organisms would usually flow in their reproductive form, the defenses are large and keep the organism alive (Salyers / Dixie, 1). However, the amoeba will not be able to replicate as a cyst, which can be a problem. When an amoeba is kept as a cyst in an adverse environment, the amoeba dies and cannot reproduce other amoebae (Salyers/Dixie, 1). Amoebae multiply by binary splitting (Blake, 1). Their generation times can be very low. Some generations can be about a day, others about seven hours.

The lowest generation time ever recorded was about two hours. It is also discussed that some rare amoebae can reproduce both sexually and asexually. To regulate osmotic pressure, most freshwater amoebae have a contractile vacuole (CV) that expels excess water from the cell. .

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