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Which part of a kidney dialysis apparatus actually takes the place of the nephron?
tubing made of selectively permeable membrane
A cell membrane is like a what?
A semi-permeable membrane. It could be compared to dialysis tubing.
What cellular structure is the dialysis tubing representing in this lab?
The dialysis tubing in the lab is representing the cell membrane of a cell. Like the cell membrane, the dialysis tubing is selectively permeable, allowing only certain molecules to pass through based on size and charge. This setup is used in experiments to study osmosis and diffusion, which are also important processes regulated by the cell membrane.
What physical property of the dialysis tubing might explain its differential permeability?
Dialysis tubing is an impermeable membrane/containment vessel that is stratified with microscopic holes which restrict certain molecules or particles from diffusing through them. This leads dialysis tubing to serve as a selectively permeable membrane because it selectively prevents certain molecules from crossing the membrane based on the size of the molecules. (Typically water and glucose will diffuse through, whereas starch and potassium iodide will not.
What does dialysis tubing represent in your model?
Dialysis Tubing is a type of semi or partially permeable membrane tubing made from regenerated cellulose or cellophane. It is used for diffusion, or more accurately osmosis. It allows the passage of small molecules but not larger ones. It is used in clinical circumstances to ensure a filtered flow of molecules, preventing the flow of larger solute molecules. Small molecules can be 'washed' out of a solution which is pumped through the tubing into a solvent, usually water, which surrounds it and in which they can be flushed away.
What is dialysis tubing supposed to mimic?
The dialysis tubing is meant to represent the semi permeable membrane of a cell. Like the cell membrane, dialysis tubing has holes or pores that only allow certain things to pass through. A cell membrane similarly will only allow certain things to pass in and out.
Is the Visking tubing a partailly permeable membrane and why?
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.
Why do you use dialysis tubing as a model for a cell membrane?
Dialysis tubing is used as a model for a cell membrane because it is selectively permeable, allowing only certain molecules to pass through, just like cell membranes. This property helps in studying processes like osmosis and diffusion in a controlled environment that mimics the behavior of cell membranes.
Type of tubing that is semi-permeable?
Semi-permeable tubing is made of materials that allow certain substances to pass through while blocking others. This type of tubing is commonly used in medical devices such as dialysis machines to filter out waste products and excess fluids from the blood. Examples of semi-permeable membrane materials include cellulose acetate and polyethersulfone.
Is dialysis tubing permeable to iodine?
No, tubing is not permeable at all, although the dialyzer is permeable to many solutes, depending on the type of dialyzer prescribed by a physician.
Why did the starch not enter the beaker?
The starch did not enter the beaker because the membrane of the dialysis tubing is selectively permeable, allowing only smaller molecules, like glucose and water, to pass through. Starch molecules are too large to pass through the pores of the membrane, thus they were unable to enter the beaker.
To Which substances was the dialysis tubing permeable?
I don't know unless you give more details!
