PPT-Diffusion, Osmosis, and the Plasma Membrane

Prefixes Suffixes and Vocabulary Diffusion the movement of particles from a high concentration to a low concentration Osmosis The diffusion of water Hyper high over Hypo. Diffusion. : The passive movement of particles from a region of high concentration to a region of low concentration until equilibrium is reached. (Molecules still move after equilibrium is reached) . Diffusion. : The passive movement of particles from a region of high concentration to a region of low concentration until equilibrium is reached. (Molecules still move after equilibrium is reached) . -. Gateway to the Cell. 2. Photograph of a Cell Membrane. 3. Cell Membrane. The cell membrane is . flexible. and allows a . unicellular. organism to . move. 4. Homeostasis. Balanced. internal condition of cells. The Cell in its Environment. Ch 7, Section 2. L3 Biology. Molecules are always moving. Molecules move randomly and bump into each other and other barriers. Diffusion. Movement of molecules from an area of high concentration to an area of lower concentration . WHAT happens in our body to our . cells. . when we drink too much . salt??. Diffusion. date. Diffusion. : when a solution spreads out everywhere.. This happens by itself because particles can naturally move around (vibration, rotation, translation of atoms). Osmosis. When the diffusing substance is water, and when the diffusion takes place through a semi permeable membrane the process is called osmosis.. Also the movement of water down a concentration gradient from an area of high solvent concentration (weak solution) to an area of low solvent concentration (stronger solution.). Chapter 7. 7.1 Cell discovery and theory. The invention of the microscope led to the discovery of cells. .. microscope . Compound Light Microscope. Series of glass lenses. Uses visible light to produce a magnified image. Molecules are always moving. Molecules move randomly and bump into each other and other barriers. Concentration gradient. Concentration Gradient - change in the concentration of a substance from one area to another.. . SIMPLE DIFFUSION. WHAT IS DIFFUSION. Diffusion is the movement of molecules or particles from a region of high concentration to a region of low concentration. . . (Guyton, 12. th. Ed. (chapter 4): . pg. 45-56) . Dr. . Ayisha. . Qureshi. Assistant Professor, Physiology. Different types of transport across the cell membrane:. Permeability of a membrane. Anything that passes between a cell and the surrounding ECF must be able to pass through the plasma membrane. . Kumar . Saha. Dept. of Zoology. Rajshahi. University. Physiology of Plasma membrane. :. The plasma membrane acts as a thin barrier which separates the intracellular fluid or the cytoplasm from extracellular fluid in which the cell live.. The plasma membrane is a SELECTIVELY PERMEABLE membrane that allows nutrients and wastes to enter and exit the cell. Homeostasis: maintaining balance in the cell. The Plasma Membrane. Selective Permeability – allows some molecules to pass through and keeps others out. primarily . of ______.. DNA. Protein. Carbohydrates. Phospholipids. 2. The . phospholipids in the cell membrane are arranged in a bilayer (double layer). How are the phospholipid molecules arranged in this bilayer?. Presented by. Dr . Sanjoy. Deka. PLASMA MEMBRANE OR CELLMEMBRANE. Points to be discussed…. Nature of plasma membrane. Movement of substances across plasma membrane. Diffusion and osmosis. Hypotonic, isotonic and hypertonic solution.