Physioex 9.0 Review Sheet Exercise 1 Cell Transport Mechanisms and Permeability Name: Jeffery Cook Lab Time/Date: 12pm 2/09/2015 Activity 1 Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. a. Two variables that affect the rate of diffusion are size and whether or not there is an electrical or concentration gradient. 2. Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction
Free Diffusion Molecular diffusion Sodium chloride
cell and because of that the water potential outside the cell would be lower than inside the cell. This would cause water (turgor pressure) to be lost by Osmosis. Osmosis is the net movement of water from high pressure to low pressure across a partially permiable membrane and it is that reason that it requires no energy for the movement. Osmosis eventually stops/slows down when water pressure has become balanced out between the “movements”. Planning & Implementing In this study I will use different
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as in the left‚ would you be able to observe any diffusion? No they would be equal Does being unable to observe diffusion necessarily mean that diffusion is not taking place? No the rate of diffusion may be either very rapid or gradual. 4th : Osmosis Did you observe any pressure changes during this experiment ? if so in which beakers and which membranes? I did not notice any pressure changes. Why? Both of the pressures in the beakers were not equal. Did the Na/Cl diffuse from the left beaker
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solution from another by osmosis. The higher the osmotic pressure of a solution‚ the more water tends to move into it. Pressure must be exerted on the hypertonic side of a selectively permeable membrane to prevent diffusion of water by osmosis from the side containing pure water. Osmotic concentration refers to the measure of solute concentration‚ defined as the number of osmoles of solute per litre of solution. These particles must be osmotically active for the process of osmosis to take place. Keeping
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Reverse logistics and the return portion of the supply chain is often an overlooked and mismanaged process. Companies tend to focus their efforts on the forward portion of supply chain management‚ while failing to take advantage of the many opportunities that reverse logistics presents (Benton‚ 2007). What these companies do not realize is that the effective management of reverse logistics has the potential to make them more profitable‚ and to add value to many other parts of their supply chain
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membrane traffic in lab‚ explain the differences between the solutions hypertonic‚ hypotonic‚ and isotonic and how they respond using the understanding of the cell membrane structure‚ types of transport mechanisms such as active‚ passive‚ diffusion‚ osmosis‚ and explain the movement of particles moving across the cell membrane. In this lab was divided into two parts. The first part was varying the concentration and the second part was varying the temperature. All cells are controlled by a cell membrane
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though the stomates open to release water‚ it also brings in carbon dioxide to produce sugar and oxygen through a process of photosynthesis. The water absorbed by the roots is moved by osmosis‚ root pressure‚ adhesion‚ and cohesion from high to low areas of water potential. From the roots‚ water is transported with osmosis with a pressure pulling the water and minerals up towards the leaves. It is the transpirational pull moving it up with the help of cohesion and adhesion. Transpiration decreases the
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Activity 1: Stimulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. The two variables that affect the rate of diffusion are: • The composition of the lipid layer‚ this content varies from tissue to tissue. For example kidney tissues have a high cholesterol content which makes them impermeable to water. • The size of the molecule‚ the larger the molecule the slower the rate of diffusion. 2. Why do you think the urea was not able to diffuse
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Abstract I found that this experiment gives me an understanding on how osmosis and diffusion works. In its simplicity‚ it explains the process that our bodies (mainly cells) use all the time. It also showed me that even with the temperature changing‚ it doesn’t drastically change the rate of diffusion. Introduction Diffusion is important in all living systems. Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water
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The Effect Salt Water Has On Radish Plant Growth By: Collins Azubuike
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