Essentially, the thinner the phospholipid bi-layer the higher the rate of diffusion as the molecules have less distance to travel before passing into the cells cytoplasm.
The rate of diffusion through a semipermeable membrane will be lowest when the concentration gradient between the two sides of the membrane is smallest, or when the thickness of the membrane is largest, limiting the movement of molecules.
Once diffusion occurs it does not matter the MWCO of the membrane, but it depends on difference of concentration, as it is said in Fick's first law.
Concentration gradient directly affects the rate of diffusion. Higher concentration gradients lead to faster diffusion rates because there is a larger difference in concentration between two areas, which results in more molecules moving from an area of high concentration to an area of low concentration.
Pressure increases the rate of diffusion. As the pressure on the membrane increase, attempts to enter the lower concentration increase, speeding the diffusion rate.
Facilitated Diffusion
The rate of diffusion through a semipermeable membrane will be lowest when the concentration gradient between the two sides of the membrane is smallest, or when the thickness of the membrane is largest, limiting the movement of molecules.
The rate of diffusion is determined by the permeability of the membrane and the concentration gradient.
Factors that influence rate of diffusionThe rate of diffusion depends on the concentration difference across the two sides of the membrane.The rate depends on the permeability of the plasma membrane to the diffusing substance.The rate of diffusion depends on the temperature of the solution.The rate of diffusion through a membrane is also directly proportional to the surface area of the membrane, which can be increased by such adaptations as microvilli.the thickness of the cell membranethe mass of the solute particlesthe difference in the initial concentration gradient*these are also factors that influence the rate of diffusion between extracellular and intracellular environments
Besides the concentration of the chemical, the pore size of the plasma membrane, and the osmotic pressure of the cytoplasm - nothing else influences the rate of diffusion of a chemical across a plasma membrane.
Factors that influence the diffusion of ions across the membrane include concentration gradient (from high to low concentration), membrane permeability to specific ions, presence of channel or carrier proteins, electrical gradients (e.g. membrane potential), and temperature. These factors collectively determine the rate and direction of ion movement across the membrane.
In simple diffusion, a substance passes through a membrane without any outside intermediary. The rate of diffusion is based on the force exerted..
Concentration gradient directly affects the rate of diffusion. Higher concentration gradients lead to faster diffusion rates because there is a larger difference in concentration between two areas, which results in more molecules moving from an area of high concentration to an area of low concentration.
Once diffusion occurs it does not matter the MWCO of the membrane, but it depends on difference of concentration, as it is said in Fick's first law.
the membrane has a greater surface area for an increased rate of diffusion
In facilitated diffusion, there are temporary openings in the cell membrane that enable certain molecules to pass through quickly.
The average thickness of respiratory membrane is 0.2 Mm
Facilitated diffusion requires membrane proteins