Osmosis .
Amoebae and paramecia require contractile vacuoles for osmoregulation. This is a process which gives these organisms that live in fresh water ability to regulate water balance.
Contractile vacuoles in protists collect water and then expel it when they become full.
Contractile vacuoles in protists collect water and then expel it when they become full.
Contractile Vacuoles
contractile vacuoles
Contractile vacuoles in protists collect water and then expel it when they become full.
The contractile vacuole helps it to get rid off the excess water from the cell.
Contractile vacuoles are formed when a food particle is engulfed. Their size depends on the size of food particle. They are not predefined. Other vacoules are predefined and exist whether the food particles are present in them or not.
It is Contractile Vacoule. Contractile Vacoule, a structure that collects the extra water and then expels it from the cell.
fresh water
Contractile Vacuoles
A pair of contractile vacuoles.