explain the role of vacuoles in freshwater organisms like chlamydomonas, Panamoeciun
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Let's take a look at exactly how contractile vacuoles work. There needs to be a set amount of solute vs. solvent in the cell. Basically, the solvent (water) needs to be in balance with the solute (other material). Since the cell works by osmosis, water moving across a semi-permeable membrane, water moves to a lower concentration of water and a higher concentration of solute.
If there is too much water, the contractile vacuole works to pump out the water. This helps to protect the cell: if there is too much water in the cell, it will swell and swell until eventually it ruptures, destroying the cell. Contractile vacuoles keep this in check. They expand when water enters (called the diastole) and contract when filled with water, carrying water along with wastes outside of the cell (called the systole).
If there is too much water, the contractile vacuole works to pump out the water. This helps to protect the cell: if there is too much water in the cell, it will swell and swell until eventually it ruptures, destroying the cell. Contractile vacuoles keep this in check. They expand when water enters (called the diastole) and contract when filled with water, carrying water along with wastes outside of the cell (called the systole).
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