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 . 6.5 Nerves, Hormones, and Homeostasis. How do neurons communicate and relay information?. http://www.pennmedicine.org/encyclopedia/em_DisplayAnimation.aspx?gcid=000089&ptid=17. Action Potential. ~1900 Julius Berstein suggested that nerve impulses were an electrochemical message created by the movement of ions through the nerve cell membrane.. By Becky . The Cell. Cytology. is the study of the structure and functions of cells.. The cell was first discovered by Robert Hooke while viewing a dried cork.. The cells have been researched for 175 years.. 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. “Head” regions of phospholipids are hydrophilic, so love water. “Tail” regions are hydrophobic, so fear water and “hide” from it. In other words, cells membranes form in water because they HAVE to!. Dissection on a giraffe: investigating the recurrent laryngeal nerve. http://www.youtube.com/watch?v=cO1a1Ek-. HD0. Electrochemical Impulses. Electrochemical Impulses. Nerve impulses are electrochemical messages created by the movement of ions through the neuron cell membrane. Chapter 48. YOU MUST KNOW. The anatomy of a neuron. . The role of active transport in establishing the membrane potential of a neuron. . How long-distance and short-distance signaling is done in neurons. . 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. HONORS ANATOMY & PHYSIOLOGY. Key terms. action potential. : A short-term change in the electrical potential that travels along a cell (such as a nerve or muscle fiber); the basis of neural communication. 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. Name. V = . i. *R or V = . i. *1/g. Ohm’s Law. E. x. =. [X]. o. [X]. i. RT. zF. ln. V. m. =. RT. F. ln. P. K. [K. +. ]. o. + . P. Na. [Na. +. ]. o. + . P. Cl. [Cl. -. ]. i. P. K. [K. +. ]. i. + . Membrane Properties chemical and electrical properties of biological membranes Jim Huettner Lecture Overview Selective permeability Osmolarity and osmotic pressure Ionic gradients Electrical properties: resistance and capacitance