PPT-Cell Membrane

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 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. 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. . 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. Summary. How do materials get across a cell's membrane. ?. It depends on the type of substance. Summary. Non-polar materials or hydrophobic materials . do. cross easily, especially if small. Ex – CO. by . Vani. Gupta. Types of cell membrane transport. Factors affecting transport. . Cell membrane. Chemical gradient. Electrical gradient. Rate of transport. . Passive transport. Cell Membrane and Cell Wall:. . ALL. . cells have a . cell membrane. made of . proteins. and . lipids. . Cell Membrane. lipid bilayer. protein channel. protein . pump. Layer 1. Layer 2. SOME. cells have cell membranes . . “ Life is a . dynamic equilibrium of hundreds and thousands and millions of chemical and biochemical reactions going on between non-living substances at ionic and molecular level”.. . -. Panday. 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.. Section 3-2 Chapter 7. Phospholipid Bilayer. The membrane is composed of two layers of phospholipids . Phospholipids are . ampipathic. . Hydrophobic tail. Hydrophyllic. head. Selectively Permeable. Notes – Membrane Structure and Function Check In 1. What is an enzyme ? 2. What do they do? Homework Study for your test, now on Friday Oct. 5 . You may want to make flashcards and save the flashcards for your final exam. Structure. Main component is phospholipids that are arranged in a double layer (. bilayer. ). Has scattered proteins within the phospholipids. Regulate what enters/leaves cell. Function . Nucleus. Structure. How was it discovered?. http://. ed.ted.com. /lessons/insights-into-cell-membranes-via-dish-detergent-ethan-perlstein#watch. The Plasma Membrane. What is the plasma membrane?. Flexible, sturdy barrier of the cell.. Plasma membranes :. Membranes. cover the surface of every cell and also surround most organelles within cells. They have a number of functions, such as:. keeping all cellular components inside the cell. Much larger than prokaryotic cells having two enveloped systems. True cells occurring in plants and animals . Though they have different shape size and physiology but all cells are typically composed of plasma membrane cytoplasm and its organelles i.e. mitochondria, endoplasmic reticulum .