PPT-Potential Across The Cell Membrane

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 05 10 4 pH 72 10. . 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. بسم الله الرحمن الرحيم. Objectives. Define Membrane . Potential. ?. Describe the electrical potential across the cell membrane.. Explain the Resting . Membrane and its cause . (Concentration . 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. 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. بسم الله الرحمن الرحيم. Objectives . Define graded potential and action potential.. Describe characteristics of graded potential. C. ompare . between the different phases of excitability during a nerve action . (Guyton, 12. th. Ed. (chapter 4): . pg. 45-56) . Dr. . Ayisha. . Qureshi. Assistant Professor, Physiology. ACTIVE TRANSPORT. Definition: . Active . transport is a . carrier-mediated transport wherein . action . potential. Prepare: . Bring voltmeter and batteries. Nice 3D visualization of neurons: . https://youtu.be/Zqtng0AfHFY. Electric eel video: . http://www.cnn.com/videos/us/2016/06/07/electric-eel-discovery-vanderbilt-university-vstan-orig-bpb.cnn. By. Dr. . Ayisha. . Qureshi. Assistant Professor, Physiology. MBBS, MPhil. OBJECTIVES. By the end of this lecture, you should be able to:. Define Nernst potential . Use the Nernst equation to calculate the values of Nernst potential for Na, K & Cl. 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 . Homeostasis & Cellular Transport. Function of the Cell Membrane:. Cell membrane separates the components of a cell from . its . environment. —surrounds the cell. “Gatekeeper” of the cell—regulates the flow of materials into and out of cell—. By. Dr. . Ayisha. . Qureshi. Assistant Professor, Physiology. MBBS, MPhil. OBJECTIVES. By the end of this lecture, you should be able to:. Define Nernst potential . Use the Nernst equation to calculate the values of Nernst potential for Na, K & Cl. 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. (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. . 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.