Biology Diffusion and Cell Membrane

IA of Okma

Osmosis

Movement of a solute from areas of high concentration to those of low concentration.

Permeable

Membrane allows entry of materials

Impermeable

Doesn’t allow entry of materials

Selectively Permeable

Some materials come in, others don’t

Solvent

The dissolver

Solute

The dissolved

Phospholipid Bilayer

What the Cell Membrane is made up of

Hydrophilic/polar

Attracted to water (heads of phospholipids)

Hydrophobic

Repeller from water (tails of phospholipids)

Integral proteins

Extend from outside of the cell to inside and are used for transportation of mterials in & out of the cell.

Peripheral proteins

Do not extend all the way through the membrane and mainly just attach to integral proteins temporarily.

If a substance contains more sugar than the outside, it will diffuse…

out

Rule of Osmosis:

Water always moves from hypotonic to hypertonic solutions.

Hypotonic

Low concentration

Hypertonic

High concentration