👉 In biology, an osmotial cell is a type of cell that has a high permeability to water (hence the name "osmotial"). These cells are found in the cytoplasm and have a membrane-bound organelle called a vacuole. The vacuoles contain various components such as proteins, lipids, and nucleic acids, which play important roles in cell metabolism and homeostasis. Osmotial cells can be classified into two categories: osmotically