Resting membrane potentials Definition: Large nerve fibers when not transmitting nerve signals is about 90 millivolt. That is‚ the potential inside the fiber is 90 millivolts more negative than the potential in the extracellular fluid on the outside of the fiber. The Na+-k+ pump also causes large concentration gradients for sodium and potassium across the resting nerve membrane. These gradients are the following: Sodium ( outside): 142 mEq/L Sodium ( inside): 14 mEq/L Potassium ( outside):
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CONCENTRATION - The Tunnel Vision Of Mind. Concentration is the art of being focused at what one is doing without permitting any form of hindrance. It is an essential skill that every individual develops as he/she grows up. It has to be developed by one’s own effort and cannot be injected into one’s mind. Of course‚ at times‚ people may guide them as to how to gain concentration‚ but the key to having full concentration is in our hands.
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1a. Aquaporins are membrane proteins that have fourteen various structures however the most common form is that of a homotetramer. The homotetramer is often found in the membrane and composed of four aquaporin membranes. The structural arrangement creates a fifth channel in the middle that allows for gas transportation. 1b. The direction of H2O molecular flow through a channel is determined by an osmotic gradient. 1c. One of the mechanisms that prevents proton channeling is due to the (ar/R) and
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Double Entry Journal #2 A double-entry journal is a type of extended annotation. There is not enough room in the book to put all of the information that you’d like to write. Since the double-entry journal is in a document‚ you can make your information as detailed as you’d like. Your goal is to choose quotes that represent at least all of the key ideas in the section. Then discuss any connections you made to those quotes or thoughts that you had while reading. An example is done for you below
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WATER FLOW ACROSS CELL MEMBRANES pg. 1 Lab Report 1 Water Flow Across Semi-Permeable Membranes WATER FLOW ACROSS CELL MEMBRANES pg.2 WATER FLOW ACROSS CELL MEMBRANES The movement of water across semi-permeable membranes as it relates to the laws of thermodynamics and energy flow with the diffusion
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Title: Ms. K Cell Membrane and Homeostasis Experiment Objective(s): The reason for this experiment is to see how starch and iodine affect each other and how a plastic bag works similar to a membrane in certain situations. Introduction: I know prior to doing this experiment that iodine mixed with starch creates a dark color and that most objects‚ organic and inorganic‚ naturally experience isotonic reactions. Hypothesis: I think that the potato will absorb more starch than the sweet potato and
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Cell Membrane Transport The purposes for these experiments is to be able to understand osmosis and its relationship to tonicity of solutions‚ and the transportation of molecules across cell membranes. It’s also used to understand‚ and how temperature affects diffusion. You also learn how to test for presences of starches and sugars in solutions. In the first exercise I will be testing for diffusion through an artificial membranes. This one has forty five steps to it. I will not go into
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The different cell membrane transport mechanisms The cell membrane is referred to as a ‘fluid mosaic model’ because the protein part within the cell membrane used to be though of as an even layer spread over the outside and the inside of the phospholipid. Now we are starting to think that it is spread unevenly‚ more like a mosaic than a layer. The phospholipid part of the cell membrane is fluid; this means that its molecules are constantly moving about. Through the molecules constantly moving
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SEXUAL DOUBLE STANDARD . Society is known to treat men and women differently despite the equality that is supposed to exist between the sexes. While sexism and gender sensitivity was at its worst during the early eras‚ it still exists nowadays because of what is known as the double standard mentality. In the poem ‘Double Standard’ Harper presents various examples of this double standard mentality that exists in the late 1800’s. The poem focuses on sexual double standard which is more appropriately
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Biological Membranes: A simulation Introduction Diffusion is the process by which collisions between molecules cause to spread apart. This movement is described as movement from an area of greater concentration to an area of lower concentration. Hence‚ diffusion continues until the molecules are equally distributed. This is to ensure that molecules have reached a state of equilibrium. Diffusion occurs spontaneously‚ no energy is involved. In cells‚ Diffusion occurs through cell membrane which is
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