plasma membrane‚ and to indicate the driving force for each. This may also be applied to the study of transport mechanisms in living membrane-bounded cells. Also‚ understanding of which way substances will move passively through a deferentially permeable membrane depending on the concentration differences. We used PhysioEx software to examine diffusion. In these experiments we used different sized membranes as well as NaCl‚ urea‚ glucose‚ albumin‚ powdered charcoal‚ and KCl. The step by step process
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Osmosis is a passive movement of water through a selectively permeable membrane moves from an area of higher concentration to an area of lower concentration. In this lab‚ we can determine the direction of diffusion of small molecules by measuring the diffusion of small molecules through dialysis tubing. This tubing acts as a selectively permeable membrane‚ and allow to pass larger molecules slowly. Introduction: Cells have kinetic energy and it causes the molecules of the cell to move around
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a 3-carbon compound called glycerol. Since there is both a hydrophilic and a hydrophobic region of each phospholipid‚ then the phospholipids are always arranged in a bilayer. The bilayer has two main strengths: it’s fluidity and its selectively permeable structure. The layer tends to be fluid or flexible since the fatty acid areas do not attract each other very strongly. This is one of the strengths of the cell membrane since it allows animal cells to have a variable shape and also allows the process
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Question #1 Pre-load can be defined as the degree to which cardiac (heart) muscle cells extend before contraction in the heart. Pre-load is one of the factors that affect the stroke volume. It directly relates to stroke volume. The way it works is that a rise in venous return to the heart raises the end diastolic volume of the ventricle which causes the muscles fibers to stretch thus increasing preload. Also‚ it increases the force of contraction of the ventricles making the heart to discharge
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Osmosis Aim: To determine the concentration of cell sap in a potato cell. Osmosis is the movement of water through a semi-permeable membrane. It starts from a weak solution and becomes a more stronger solution until the concentrations on both sides are equal. To investigate the range of solutions needed to find the point at which the surrounding solution is the same as the cell sap in the vacuole.
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the transport of protons to produce a proton gradient. This proton gradient powers the phosphorylation of ATP associated with ATP synthase. Osmosis Osmosis is a special example of diffusion. It is the diffusion of water through a partially permeable membrane from a more dilute solution to a more
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the water has an effect on the potato cells. Demonstrate diffusion across a semi-permeable membrane and measure the effect of concentration in the process . Differentiate between hypotonic‚isotonic and hypertonic environment. Hypotonic is a condition in which the environment has a higher solute concentration than inside animal or plant cell. Isotonic is equal concentration that has net flow of water a cross permeable membrane. We will compare salt water to fresh water so we can see if there is an
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Osmosis is the diffusion of water molecules across a semi-permeable membrane. Diffusion is the movement of molecules from an area of high concentration‚ to an area of low concentration. So‚ Osmosis is the movement of water molecules from an area where there are lots of water molecules to an area where there are few water molecules. Our aim is to find the concentration of dissolved substances in the cells of a potato using Osmosis. I predict that the potato in the higher concentration of salt
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Describe the fluid-mosaic model of a plasma membrane. Discuss the role of the membrane in the movement of materials through it by each of the following processes: a. Active transport b. Passive transport The plasma membrane is a semi permeable barrier that separates the inside of the cell from the outside environment. The plasma membrane is made up of carbohydrates‚ cholesterol‚ proteins‚ and a lipid bilayer‚ or double layer of lipids. The plasma membrane may be known as a fluid mosaic
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Solute Concentration of Potatoes Lab #1 Purpose: To find the molarity/concentration of potato cytoplasm. Materials: As on page 1 in the lab handout. Procedure: As on page 1 in the lab handout. Data and Observations: Test Tube # | Concentration of sucrose solution (mol/L) | Initial Mass (g) | Final Mass | Percentage change in mass | 1 | 1.0 mol/L | 3.00g | 2.25g | -25.0% | 2 | 0.9 mol/L | 2.70g | 2.07g | -23.3% | 3 | 0.8 mol/L | 2.92g | 2.25g | -22.9% | 4 | 0.7 mol/L | 2.60g
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