Osmosis Lab Report

Osmosis and diffusion are passive transport mechanisms, meaning that no energy has to be added into the system in order for transport to occur, which the cell uses in its selectively permeable membrane. Osmosis involves the transportation, or movement, of water from an area of low solute concentration to an area of higher solute concentration. Diffusion is the movement of solute particles from areas of high solute concentrations to areas of lower concentrations of solutes. Therefore, both osmosis and diffusion work on a concentration

In osmosis, the flow of the water from or to a cell depends on whether the cell is immersed in a solution that is isotonic, hypotonic, or hypertonic to the solution. If the cell is isotonic to a solution, this means that the solute concentration of a cell and its environment is the same and therefore there will be no movement of water. If the solute concentration is lower than that of the cell, then water will flow into the cell, causing it to expand. If the solute concentration is lower than that of the cell then water will flow out of the cell, causing it to shrink.

Mustafa Elgabry October 17, 2016 Period 3 Egg Lab Introduction: The cell membrane benifits the cell in many different ways and is composed of many different parts which help the membrane execute what it is supposed to practice. A model that represents these parts is called the fluid mosaic model. The model contains proteins and carbohydrates within a phospholipid bilayer that consists of hydrophobic tails and hydrophilic heads. All of the components within the bilayer play a role in the function of the cell membrane. For example the carbohydrates practice cell to cell recognition while the proteins transport molecules in the cell and back out. Proteins also have alternate functions such as intercellular joining and extracellular matrix. When molecules transport in and out of the cell through the membrane, there are two types of transport, passive and active transports. Passive transport occurs when molecules move with the concentration gradient. One example is simple diffusion, where the molecules transport through the cell membrane effortlessly moving from a high to low concentration. Then there is facilitated diffusion where the molecules such as glucose move with the concentration gradient but have to use a protein to pass through the membrane. Osmosis, however, is the diffusion of water molecules across the membrane, but the water molecules also need to pass through a protein because the inside of the lipid bilayer consists of hydrophobic tails. The purpose

Introduction Osmosis is the passive movement of water from an area of low solute concentration to an area of high solute concentration, normally across a membrane which prevents the movement of solvent. This is a process by which materials may move into, out of, or within cells. Osmosis doesn’t depend on energy provided by living organisms but is affected by the properties of the cell membrane. The rate of osmosis is dependent on such factors as temperature, pressure, molecular properties such as size and mass, and the concentration gradient. In osmosis, the relationship between a solute’s concentration outside of cell and inside of a cell is described in terms of the tonicity of the solution outside of the cell. A cell is in a hypotonic solution when the solute is more concentrated inside the cell and therefore water moves into the cell. In this solution the cell swells as water enters, this may continue until it ruptures or hemolyzes. In the reverse condition, the cell is in a hypertonic solution

Introduction The movement of water molecules across a semi-permeable membrane is the process of osmosis. If there is a solute and a solvent, each containing different concentration levels, then the water would move along its concentration gradient until each side of the membrane are equal. The water moves because the membrane is impermeable to the solute and the solute concentrations may differ on either side of the membrane. Water molecules may move in and out of the cell, but there is no net diffusion of water. Water will move in one direction or the other, and this is determined by the solute or solvents concentration levels. If the two solutions are of equal concentrations, they will be isotonic. If the concentrations are unequal, the

Abstract Cells and molecules in the environment are constantly moving and changing, for cells to function properly there is a need for equilibrium to be met. The size of the cell and the solution outside of the cell affects the rate of diffusion and osmosis in the cell. Cells are constantly trying to reach an equilibrium with the molecules and substances around it, which is why there are such terms as: hypertonic, hypotonic and isotonic. The procedures allowed testing of whether or not surface area or volume increased diffusion and how different substance control diffusion. Cells are constantly moving to reach equilibrium through diffusion and osmosis.

OSMOSIS Osmosis is a special type of diffusion. It is the diffusion of water molecules across a semipermeable membrane (a membrane that allows for the diffusion of certain solutes and water) from an area of higher water concentration to one of lower water concentration. For example, if a 1 M aqueous starch solution is separated from a .5 M aqueous starch solution by a semi-permeable membrane, then water molecules will move from the .5 M aqueous starch solution (higher water molecule concentration) toward the more concentrated 1M starch solution (lower water molecule concentration) until an equilibrium of water molecules exists between the two solutions. Since the semi-permeable membrane did not allow for the passage of starch molecules, the 1M-starch solution will gain in volume as the water moves in (Figure 3).

Introduction All cells contain membranes that are selectively permeable, allowing certain things to pass into and leave out of the cell. The process in which molecules of a substance move from an area of high concentration to areas of low concentration is called Diffusion. Whereas Osmosis is the process in which water crosses membranes from regions of high water concentration to areas with low water concentration. While molecules in diffusion move down a concentration gradient, molecules during osmosis both move down a concentration gradient as well as across it. Both diffusion, and osmosis are types of passive transport, which do not require help.

How Do Different Concentrations of Sucrose Influence Osmosis of a De-Shelled Egg 10/14/2017 BIOL 2110L Professor Rollins By: Autumn Maxey Lab Partners: Joanna Galan, Karena Newell, Allyson Clark Introduction: Osmosis by definition is the process of diffusion in which a fluid moves from an area of less concentration a hypotonic solution, of dissolved particles to a region of higher concentration or hypertonic solution, of dissolved particles across a semi-permeable membrane (a membrane that only allows specific membranes to pass through it). Because there is a difference in the concentration gradient, the dissolved particles are free to move across the semi-permeable membrane from the higher concentration to the lower concentration.

In the case of this experiment, if a cell is placed in a hypertonic solution as seen above in the figure 7a, water will leave the cell to move down its own concentration, and the cell shrinks. In the isotonic solution as seen above in figure 7b, the concentration of solute and water are equal so there is no net movement in the flow of water outside or inside the cell, so the shape of the cell does not change. Finally, in the hypotonic solution in figure 7c, the net movement of the water is inside the cells which makes the cells swell

Osmosis is described in one of three ways when comparing more than one solution. The cell’s external and internal environment helps determine tonicity, which is defined as how the cell reacts to its environment. When the cell’s environment is equal in osmolarity to itself and there is no change, it is considered an isotonic solution. When the environment has a higher osmolarity, shrinkage occurs and it is considered a hypertonic solution. When the environment has a lower osmolarity, swellings occurs and it is considered hypotonic.

William B. Walker Professor Graves Human Anatomy & Physiology Lab 1 Lab Report Introduction Diffusion is defined as the movement of molecules or ions from an area of a higher concentration to an area where they are in lower concentration. The driving force for diffusion is kinetic energy. The speed of diffusion is influenced

Introduction/Background Information: Osmosis is the movement of water passing through the semipermeable membrane. Osmosis always passes from an area where water has more concentration to an area where water has less concentration. Osmosis has three solutions: a hypotonic solution, a hypertonic solution, and an isotonic solution. A solution that is has

Introduction Osmosis is when water passes through a cell membrane, it is also form of a diffusion, which is a form of passive transport. Osmosis will continue to until an equilibrium is reached which is when the solutions are isotonic. This means that the solution has the same amount of solute on both sides. If the solution is hypertonic, it has more solute in the solution. In this situation water will move towards it. if the solution is hypotonic, it has less solute in the solution. Whereas in this situation, water will move out of the solution.

Only uncharged, small, polar molecules, (such as water) and hydrophobic molecules, (such as oxygen, carbon dioxide) and lipid-soluble molecules (such as hydrocarbons) can freely pass across the membrane. All ions and large polar molecules (such as glucose) are not permeable to the membrane. Membrane structure The plasma membrane maintains dynamic homeostasis