1. a. The action potential changes the membrane potential from -70 mV (resting) to +30 mV and back again to the resting membrane potential. b. This results from a change in membrane permeability first to Na then to K due to the opening of what type of ion channels? Voltage gated channels 2. a. Where is the density of voltage-gated Na+ channels the greatest? Axon hillock b. What areas of the neuron generate signals that open these voltage-gated channels? Dendrites and the cell body c. Opening
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|A protein found in muscle cells. It is the main component of the thin filaments. | |Action potential |A brief reversal of the resting potential across the cell surface membrane of a neurone. All action | |
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Bag 3 had a rate of osmosis equal to 0.0471 grams per minute. Bag 4 had a rate of osmosis equal to 0.0886 grams per minute. Bag 5 had a rate of osmosis equal to -0.0914 grams per minute (Figure A). Figure A: Shifting of mass in grams for each dialysis bag was measured every 5 minutes for 30 minutes. Bag 1 contained DI H2O and was submerged in DI H2O. Bags 2‚ 3‚ and 4 were submerged in DI H2O and contained 20%‚ 40%‚ 60% sucrose‚ respectively. Bag 5 was submerged in 60% sucrose and contained DI
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region of high concentration to a region of low concentration across a partially permeable membrane. Osmosis is complete when all of the water molecules have been evenly spread out and can take place either in plant cells or animal cells‚ so long as a partially permeable membrane is present. Osmosis can also be conducted in the visking tubing experiment‚ where the visking tubing is an artificial permeable membrane. So how does Osmosis take place? When you put an animal or plant cell into liquid containing
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fluid-mosaic model of a plasma membrane. Discuss the role of the membrane in the movement of materials through each of the following processes: a.) Active Transport b.) Passive Transport All living cells contain a plasma membrane‚ which acts a boundary for the cell. The plasma membrane regulates the cell’s chemical composition because it uses selective permeability to allow certain substances to enter or exit the cell more easily than others. The formation of this membrane is believed to be one of
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The Nervous System: Membrane Potential 1. Record the intracellular and extracellular concentrations of the following ions (mM/L): | Intracellular | Extracellular | Sodium (Na+) | 15 | 150 | Potassium (K+) | 150 | 5 | Chloride (Cl–) | 10 | 125 | 2. Excitable cells‚ like neurons‚ are more permeable to K+ than to Na+. 3. How would the following alterations affect the membrane permeability to K+? Use arrows to indicate the change in permeability. a. An increase in the number of passive
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combination of membrane permeation and evaporation. It is often an attractive alternative to other separation methods. Pervaporation is a membrane process in which a liquid is maintained at atmospheric pressure on the feed or upstream side of the membrane and where permeate is removed as a vapor because of a low vapor pressure existing on permeate or downstream side. This low (partial) vapor pressure can be achieved by employing a carrier gas or using a vacuum pump. Membranes like poly dimethylsiloxane
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Houston Dialysis Center is a department of Houston General Hospital‚ a full-service‚ not-for-profit acute care hospital with 325 beds. The bulk of the hospital’s facilities are devoted to inpatient care and emergency services. However‚ a 100‚000 square-foot section of the hospital complex is devoted to outpatient services. Currently‚ this space has two primary uses. About 80 percent of the space is used by the Outpatient Clinic‚ which handles all routine outpatient services offered by the hospital
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passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration (Purchon 1). Diffusion is the movement of a substance from an area of high concentration to low concentration (Biological 21). With this knowledge we tried to recreate diffusion for students to understand the process. The dialysis bags represented our selectively permeable membrane with the fluid inside it‚ sucrose. How much of the substance moves from the cup to the
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Introduction: The purpose of this lab was to observe passive transport of molecules through diffusion and osmosis. We had to keep close observation on two dialysis bags and explain how we measured the change in weight as diffusion and osmosis occurred throughout the experiment. Cells produce an energy called Kinetic Energy. This causes molecules of the cell to move around and bump into each other. Diffusion is one result of this molecular movement. Diffusion is the passive movement of molecules
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