PPT-Movement of Substances through a Cell Membrane

BIOLOGY Unit 11 Double Award Unit 11 How do s ubstances enter and leave c ells Molecules move quickly and at random from a region of high concentration to low concentration down a . Learning Objectives. outline the roles of membranes within cells and at the surface of cells. state that plasma (cell surface) membranes are partially permeable barriers. describe, with the aid of diagrams, the fluid mosaic model of membrane structure. What is the difference between diffusion and osmosis. ?. Objective. Students will be able to describe the movements of substances into and out of cells.. Why is it important?. Understanding the mechanisms of transport across the membrane is important for understanding aspects of physiology.. . By Dr. . Vani. Gupta. 2. “Polarity” . of the . membrane. Na. +. K. +. Mg. 2+. Ca. 2+. H. +. HCO. 3. -. Cl. -. SO. 4. 2-. PO. 3. -. protein. inside. (in mM). 14. 140. 0.5. 10. -4. (pH 7.2). 10. Water. Air. & Soil. Chapter 3.1:. Transport of Substances in Air. Release. of the chemical at the source. Dispersion. of the chemical in the atmosphere (scatter in various directions). Deposition. and Transport. Cell Membrane. Cell membrane- also called the . Plasma Membrane. Separates the cell from its surrounding . environment.  . Helps maintain homeostasis which is keeping the internal conditions constant. by . Vani. Gupta. Types of cell membrane transport. Factors affecting transport. . Cell membrane. Chemical gradient. Electrical gradient. Rate of transport. . Passive transport. Chapter 3. Cell Membrane. Selectively permeable: allows . some. things to enter and leave. . Cell Membrane. Made of phospholipid bilayer. Cell Membrane. Made of a series of proteins.. https://www.youtube.com/watch?v=moPJkCbKjBs. 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. Harmful substance-many materials or substances used or created that could harm your health. These substances could be dusts, gases, or fumes that you breathe in, or liquids, gels or powders that come into contact with your eyes or skin. . Cell Membrane. .. The cell membrane . Controls. what comes out and . in of the cell. . It also provides protection.. The composition is a double layered sheet called a . Bi-lipid layer. .. This lipid bi-layer is made up of two . Learning . Goal . Describe . the composition and function of the lipid bilayer in cell membranes.. Cell Membranes. Cell membranes. . are semipermeable so that nutrients can enter the cell and waste products can leave.. Recall your work yesterday. When classifying cells, what are the two groups scientists separate cells into? . USING A MICROSCOPE. Light Microscopes and Total Power Magnification. Uses. We can use microscopes to observe cells in greater detail. What is the plasma membrane?. A flexible boundary between the cell and its environment which maintains . HOMEOSTASIS. within the cell. **Remember that . HOMEOSTASIS. is a state of balance/equilibrium within the cell.. . The cells that make up the bodies of all but the simplest multicellular animals, both aquatic and terrestrial, exist in an "internal sea" of . extracellular fluid (ECF). enclosed within the integument of the animal. From this fluid, the cells take up O.