The variable that affects osmotic pressure is You correctly answered: a. the concentration of nondiffusing solutes. 4. The net movement of water would be into the cell in a You correctly answered: b. hypotonic solution. page 1 Experiment Results Predict Question: Predict Question 1: What effect do you think increasing the Na+ Cl- concentration will have? Your answer : a. increased osmotic pressure Predict Question 2: What do you think will be the pressure result of the current experimental conditions?
The rate of osmosis is affected by variables, two of them being temperature and concentration. In this experiment, the class will divide into two sections: some groups will look at the change in osmosis due to temperature, and the other groups will look at the change due to concentration. In osmosis, water moves from high concentrations of water to low concentrations of water. The water will try to move from outside the bag to the inside in order to dilute the solute, which in our experiment, is sucrose. Phospholipid bilayers and protein molecules form a semi-permeable boundary around the cell.
Answer: C, the 5% NaCl creates a hypertonic environment which would cause the cell to lose water. 4) The best definition of osmotic pressure is A) The movement of solute molecules from a higher to a lower concentration. B) The force with which a solvent moves across a semipermeable membrane from a higher to a lower concentration. C) The movement of a substance across a semipermeable membrane from a higher to a lower concentration. D) The active transport of a substance out of a cell to maintain equilibrium.
Laura Mccain Lab 5: Osmosis with Hypertonic, Isotonic and Hypotonic tonicity Purpose: The purpose of this lab is to familiarize you with osmosis and, specifically, what happens to cells when they are exposed to solutions of differing tonicities. Hypothesis: Hypotonic Solution: the cell has a higher concentration in it than in the area surrounding it. Water moves into the cell to equal out concentration. Isotonic Solution: The cell has a equal proportion of concentration with the area surrounding. Water continually flows in and out to keep concentration even.
Cell Membranes are what controls what enters and what exits the cell by the process of osmosis. When a cell is places in a solution in which the concentration of a solute in the surrounding environment is greater than the concentration within the cell, it is hypertonic. Water will leave the cell in order to dilute its surroundings. This will shrink and damage the cells interior. However, when is it placed in a solution where the concentration of the solute in the surrounding environment is less than the concentration within the cell, it is hypotonic.
o Carbon dioxide produced by respiration diffuses out of cells. Osmosis: - Water often moves across boundaries by osmosis. - Osmosis is the diffusion of water from a dilute to a more concentrated solution through a partially permeable membrane that allows the passage of water molecules. - Differences in the concentrations of the solutions inside and outside a cell cause water to move into or out of the cell by osmosis. - If there is a higher solute concentration on one side of a membrane, water will move in that direction.
physioex 9.0 Review Sheet Exercise 3 Neurophysiology of Nerve Impulses Name _Jasmine Talley________ Lab Time/Date __11/6/13____ Activity 1 The Resting Membrane Potential 1. Explain why increasing extracellular K+ reduces the net diffusion of K+ out of the neuron through the K+ leak channels. By increasing the extracellular K+ there is efflux and also influx into the cell which increases the tendency of the cell to depolarize.___ 2. Explain why increasing extracellular K+ causes the membrane potential to change to a less negative value. How well did the results compare with your prediction?
As sucrose moves out of the phloem sap and into surrounding cells (with energy), water flows out of them. This reduces the pressure in the sieve cells at the sink region (less sugar) and the water moves back to the phloem Perform a firsthand investigation to demonstrate the effect of dissolved carbon dioxide on the pH of water 1. Blowing through a straw into the water 1. High technology read the levels of water pH as the carbon dioxide from our breath was dissolved into the water Perform a firsthand investigation using the light microscope and prepared slides to gather information to estimate the size of the red and white blood cells and draw scaled diagrams of each 2. Red blood cell = 7-9 um (micro metres) 3.
Egg Osmosis Lab Team__________________Per____ Purpose: The purpose of this lab is to demonstrate what happens when an animal cell is exposed to varying osmotic conditions Questions: What happens when a cell is subjected to a solution where the water concentration is higher than that inside a cell (hypotonic solution)? What happens when a cell is subjected to a solution where the water concentration is lower than that inside a cell (hypertonic solution)? What happens when a cell is subjected to a solution where the water concentration is equal to that inside a cell (isotonic solution)? The cell is like a salty sea that is mostly water. The cell membrane in an animal cell is both a protective barrier and a filter to keep unwanted materials out and bring needed materials inside.
Body fluids are maintained at a constant level by several homeostatic mechanisms. • Osmosis Osmosis is the movement of a solvent, such as water, across a semipermeable membrane from a solution that has a low solute concentration to one that has a higher solute concentration. • Diffusion Diffusion is a process where particles within a substance, move from an area of high concentration to one of a low concentration. • Active transport Active transport is the movement of particles or ions across a cell membrane against a concentration gradient, an area of low to high concentration, which requires the use of energy. (Harris, P., Nagy,S.