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Why a protist living in salt water doesn't need a contractile vacuole?
Wiki User
∙ 6y ago
Protists have salt particles inside their cytoplasm. When they are in freshwater the concentration of salt particles inside is higher than outside... however when they are in salt water the concentration is equally spread... (diffusion) the contractile vacuole job is to remove excess water... but if its in saltwater.. there isn't a need because. Of the diffusion that takes place.
Wiki User
∙ 12y ago
Wiki User
∙ 6y agoI'm not positive about the accuracy of this answer. Basically, the membrane of the contractile vacuole is selectively permeable to only allow osmosis (not diffusion of salt). The salt content outside the vacuole will thus be much higher than in the contractile vacuole. Because salt cannot enter the vacuole to achieve equilibrium, water must leave. This will make the contractile vacuole useless and probably inactive.
Also, fresh water organisms tend to be hyper-osmotic with too much water. The contractile vacuole rectifies this. However, a certain amount salt in the water may make the organism iso-osmotic, which is to say that the water-salt content of the organism is in equilibrium with the outer environment.
*****Another way to explain this is that the contractile vacuole is used to pump water out of the cells. In salt water the water potential is lower than the water in the protist. Water always wants to move towards the solute/lower water potential. As a result, the protist is always losing water since the water is moving towards the salt in the saltwater. A saltwater protist wouldn't want to be pumping water out of its body, if its already losing it.
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The structure that keeps a Paramecium living in fresh water from swelling and bursting is called a?
contractile vacuole
What organelle allows free-living protists to expel extra?
The contractile vacuole allows free-living protists to expel extra water
What are single celled living things in pond water called?
A Protist(s)
What are 6 kingdoms of living things?
Eubacteria, Archea, Protist, Fungus/Fungi, Plants, Animals
Why are so many living thing dependent on plant like protist?
because you're stupid
What organell allows free living protists to expel extra water?
The contractile vacuole allows free-living protists to expel extra water
The structure that keeps a Paramecium living in fresh water from swelling and bursting is called a?
contractile vacuole
What organelle allows free-living protists to expel extra?
The contractile vacuole allows free-living protists to expel extra water
What organelle allows free-living protists to expel extra water?
The contractile vacuole allows free-living protists to expel extra water
What type of organisms have cells with very large vacuoles?
A contractile vacuole is a type of vacuole involved in osmoregulation. It pumps excess water out of a cell and is found prominently in freshwater protists. In a Paramecium, a common freshwater protist, the vacuole is surrounded by several canals, which absorb water by osmosis from the cytoplasm. After the canals fill with water, the water is pumped into the vacuole. When the vacuole is full, it expels the water through a pore in the cytoplasm which can be opened and closed. This pore has, in some forms of paramecium, disappeared entirely when in use, leading to the idea of a "second cell" in paramecium. Other protists, such as Amoeba, have contractile vacuoles that move to the surface of the cell when full and undergo exocytosis. The contractile vacuole basically stores the extra water, in cells (mostly ciliates) in itself, so if there's a change in environment, a drought for example, the contractile vacuole can release more water into the cell. But if there's a flood, this vacuole will suck a lot of excess water out.
What is the function of the contractile vacuole in a protozoan?
Living in fresh water, a hypotonic environment, causes water to enter the cell of certain protists (protozoa ) and would lysis the cell unless there were a way to expel this water. This is what contractile vacuoles do. When the fill with enough water microfilament contraction expels the excess water from the vacuole and helps the cell maintain internal isotonicity.
Why does amoeba die when cyanide is added to its water?
Cyanide is a toxic acid or salt and is deadly to just about any carbon based human life form. When Cyanide is added to the water of an Amoeba it stops the contractile vacuole from working, the contractile vacuole is vital in the survival of the Amoeba, because without it the Amoeba would basically just explode with water and die. The contractile vacuole pumps away the excess water. But, when cyanide is added to the water like I said the contractile vacuole will malfunction and not work. This will in the end result in the death of the cell.... I hope that helped!! :)
Why contractile vacuoles would be of little value to one cell organisms living in the ocean?
I do get it,for the organism living in the hypertonic salt water(ocean) the contractile vacuole is most not needed since the water in the organism are already on thier way out!
Is protist living or nonliving?
Living
Are animal like protist living or nonliving?
Living offcourse.
Is protist a living or non living?
Protists are living. They are eukaryotic and belongs to kingdom protista.
What living things are classified into 5 kingdoms?
Living things are divided into five kingdoms: animal, plant, fungi, protist and monera. Living things are divided into five kingdoms: animal, plant, fungi, protist and monera. Living things are divided into five kingdoms: animal, plant, fungi, protist and monera.
