a visking tube is a tube made out of a flimsy plastic that you use in science experiments to hold a solution. The visking tubes have tiny tiny holes in the plastic allowing the molecules to pass through. The tubes usually have holes at each end so you have to tie them up with string or something.
In my case we were using the visking tubes to represent the small intestine you can also use the visking tube with startch water and 10 drops of iodine in in (tie up before on one end), then tie up the other side and place in a test tube half full with water. you should then see blue in the water! this works because of the tiny holes in the visking tube.
hope this helps!!
Washing the outside of the visking tubing helps remove any contaminants or bacteria that could potentially contaminate the contents inside the tubing. This step is crucial to ensure that only the intended molecules can diffuse in or out of the tubing without interference.
You may be thinking of the blood capillaries. Like visking tubing, their walls are able to let substances diffuse in and out. This is also true of the cell membranes. However both of these are much more permeable than visking tubing. The kidney contains semi-permeable membranes which allow urea to pass through but not other substances such as proteins.
Yes, it is a partially permeable membrane. It allows certain substances like glucose and water molecules to diffuse through but not large molecules like starch and sucrose. Selectively permeable.
Visking tubes can typically be found at scientific supply companies, online retailers that specialize in laboratory equipment, or possibly at a university or research institution that uses them for experiments.
Put a sucrose solution into the visking tube and fasten the ends, then place it in water (at different temperatures). The varying temperatures would quicken or slow the rate of diffusion (osmosis). Then using iodine, you put some in the water that the visking tube was in and if it turns dark blue/black the more sucrose has diffused. This can be put into a calorimeter to check the intensity for different temps. You should find that the higher the temp. the higher the rate of diffusion (because particles are excited and have more kinetic energy and move more). Hope this helps =) Sana (17 yrs)
Cannot pass through visking tubing: sugar starch lactose sucrose Can pass through visking tubing: Iodine Glucose Maltose
visking tubing
capillaries in the villi
No, salt molecules are too large to pass through the pores of Visking tubing, which is a semi-permeable membrane. Only smaller molecules like water can pass through the tubing via osmosis.
Washing the outside of the visking tubing helps remove any contaminants or bacteria that could potentially contaminate the contents inside the tubing. This step is crucial to ensure that only the intended molecules can diffuse in or out of the tubing without interference.
Starch must be broken down into smaller molecules like glucose before it can enter the Visking tubing, as the tubing only allows smaller molecules to pass through its semi-permeable membrane. This breakdown of starch into glucose is typically achieved through the process of digestion, either by enzymes in the body or by external sources such as amylase. Once the starch is broken down into smaller molecules, it can pass through the Visking tubing via osmosis or diffusion.
Because it has starch in it.
the visking tubing is useless and we need an alternative. can u helpful human beings help please? we are in the middle of a chaotic crisis trying to find the reason for osmosis. please help you kind human beings :) i hate you bye -from the scientists of Mars :
so as to prevent contamination. that should be one point.
The kidneys act like a visking tubing in our body. They filter blood and selectively reabsorb substances to maintain the body's balance of electrolytes and fluid volume. This process helps remove waste products from the blood while retaining important nutrients.
In experiments using Visking tubing (dialysis tubing), water typically represents the solvent in which solutes are dissolved. It serves as a medium for demonstrating osmosis and diffusion, illustrating how substances move across a semi-permeable membrane. The movement of water into or out of the tubing simulates the processes of nutrient absorption and waste removal in biological systems. This helps visualize how concentration gradients influence the movement of molecules.
We supply Visking tubing and offer the following information: The molecular weight cut-off of this product is 12000 - 14000 daltons. This means in theory that molecules larger in MW than this will not pass through the membranes and ones smaller will. Starch has a very high molecular weight and the tubing is often used to illustrate the effect of enzymes breaking starch down into to simple sugars. Starch therefore should not pass through the membrane wall. The user of this product should be aware that this is a nominal cut-off and long thin molecules above the 14kd cut-off may go through and globular molecules below may be retained. In addition the charge on a molecule may effect the rate of transfer across the membrane.