1. Epithelial tissues are classified according to the shape of the cells and number of the cell layers formed. What are the two classification terms based on the number of layers formed? (Choose answers below) A) Simple B) Villi C) Dense D) Startified  E) Loose 2. What are functions of cuboidal cells in the kidney? Choose all that apply. A) Dilution of chemicals B) Concentration of gases C) Nutrition to tissues  D) Absorption of molecules  E) Support of tissues F) Secretion of molecules  3. In plants, epithelial tissue is only found as the outermost cell layer and acts as a barrier. In humans, epithelial tissue is found inside the body as well as on the surface. What function(s) does/do epithelial tissue carry out in humans? Select all that apply. A) Protection  B) Diffusion  C) Osmosis  D) Filtration  E) Waste storage  F) Oxygen transport  G) Absorption

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Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.