What makes a membrane more permeable?
Temperature makes the lipid more fluid and more permeable, so membranes that need to withstand high temperatures often contain more saturated fats to make them stable. Cell membranes also contain transport proteins and channels to regulate movement of ions into and out of the cell.
Why would some cells more permeable to some substances than others?
Why are some cell types more permeable to a substance (for example, sodium ions) than others? – the cell is able to take up a variety of small molecules and ions while excluding others. – substances that move through the membrane at different rates. Type of proteins going in and going out of the cell.
What determines the permeability of a cell membrane?
The hydrophobic center to a cell membrane (also known as a phospholipid bilayer) gives the membrane selective permeability. Cell membranes are primarily composed of lipid molecules called phospholipids.
Does concentration affect membrane permeability?
The magnitude of the concentration gradient depends on the membrane permeability. The concentration gradient changes the available surface area. It is suggested that a high-permeability compound is absorbed mainly from the top of the villi, while a low-permeability compound is absorbed from the whole villous surface.
What makes the cell membrane selectively permeable or semi permeable?
Cell membrane is selectively permeable (Semi-permeability- only let in some molecules inside the cell) because of its structure. Phospolipid bilayer, with some protein, is what makes the cell membrane selectively permeable. Cell membrane is made up of two sheets of phospolipid.
What factors affect the diffusion of water through a membrane by osmosis?
What factors affect the diffusion of water through a membrane by osmosis? The permeability of the membrane and the amount of water on each side of the membrane. If there is less water on one side, the water will diffuse to that side to even out the concentration of both sides.
What other factors affect the permeability of cell membranes?
The permeability of cell membranes is affected by things like temperature, pH and ethanol.
How can you increase the permeability of a cell membrane?
Membrane Operations in Molecular Separations The membrane permeability value can be increased by increasing either the distribution coefficient or the diffusivity for the transported solute.
What factors most affect the rate of diffusion?
The greater the difference in concentration, the quicker the rate of diffusion. The higher the temperature, the more kinetic energy the particles will have, so they will move and mix more quickly. The greater the surface area, the faster the rate of diffusion.