Osmosis Introduction 4q5m11

Thanawin Ungkananuchat

Introduction The cell membrane is a very important part of the cell. It is an organelle which was created from mostly lipids and protein. It has a phospholipid bilayers that is a semi-permeable membrane which means it only allow some materials to through it while others don’t. According to Bailey (2017), it function is to maintain the cell structure and maintain the cell the balance of components in the cells. It can maintaining the cell balance by transport material through the cell or simply cellular transport. Roisen (n.d.) reported that cellular transportation can be divide into 2 types ive transport and active transport. Active transport is moving molecules against the concentration gradient or from low concentration to high concentration by using an ATP. While ive transport move them from high concentration gradient to low concentration or along with the concentration gradient without using any energy instead. ive transport can be divide in to 3 types simple diffusion, facilitate diffusion and osmosis. Facilitate diffusion can be in both in active and ive transport and have the assistance of protein, it is used for an object that can’t directly through the membrane such as large object or ions, but sometimes small object can through too. Simple diffusion is for small and polar or nonpolar molecules to through the phospholipid bilayer directly. And last, osmosis. This is more focus on the concentration of water rather than the concentration of the solute, as the higher concentration of the water is the lower the concentration of solute there is, so the water will move the opposite direction of the solute. When both water and solute can through the membrane they will eventually be at equilibrium. But in the case that only the water can through the membrane the water will move to the side with less water ratio compared to solute. The side with more water or less solvent is called hypotonic and on the side that have less water or higher solvent is called hypertonic. If the concentration is the same on both side it will be called isotonic. We will do an experiment about osmosis. In this experiment we will use a piece of potato and jelly the represent the cell membrane of plant and animal cell. We will put them both in a hypotonic and hypertonic solution to see the process of osmosis. we even put one each in the empty beaker to compare later. We will measure the volume and mass of each object before and after to see the change of how water move in or out of them.

Thanawin Ungkananuchat

References Biggs, A. (2009). Biology. Columbus, OH: Glencoe/McGraw-Hill. Bailey, R. (2017, February 08). What is a Cell Membrane? Retrieved March 09, 2017, from https://www.thoughtco.com/cell-membrane-a-cell-biology-definition-373299 Bailey, R. (2017, March 16). Cell Membranes Function, Structure and Composition. Retrieved March 09, 2017, from https://www.thoughtco.com/cell-membrane-373364 Roisen, P. (n.d.). Cell Transport - Biology Video by Brightstorm. Retrieved March 09, 2017, from https://www.brightstorm.com/science/biology/cell-functions-and-processes/cell-transport/ Roisen, P. (n.d.). Cell Diffusion - Biology Video by Brightstorm. Retrieved March 09, 2017, from https://www.brightstorm.com/science/biology/cell-functions-and-processes/cell-diffusion/ Roisen, P. (n.d.). Osmosis - Biology Video by Brightstorm. Retrieved March 09, 2017, from https://www.brightstorm.com/science/biology/cell-functions-and-processes/osmosis/