the movement of water molecules from an area of high concentration to low concentration


the substance dissolved in a liquid

hypertonic solution

contains a high level of concentration relative to the cell

hypotonic solution

contains a low level of concentration relative to the cell

isotonic solution

contains the same concentration of solute relative to the cell


A homogeneous mixture of two or more substances


Uniform in structure or composition throughout

semipermeable membrane

A membrane that will let some substances through, but not others


the death of a cell by bursting

phospholipid bilayer

A two-layered arrangement of phosphate and lipid molecules that form a cell membrane, the hydrophobic lipid ends facing inward and the hydrophilic phosphate ends facing outward.


the movement of molecules from an area of higher concentration to an area of lower concentration


the maintenance of stable internal conditions despite changes in the surroundings


repels water


water loving phosphate head


a substance that dissolves another substance


results from loss of water and loss of pressure in the plants cells.

turgor pressure

the pressure that water molecules exert against the cell wall.


Aquatic plant with translucent (see-through) leaves that grows in fresh water ponds

passive transport

The movement of materials through a cell membrane without using energy

active transport

movement of molecules across a membrane requiring energy to be expended by the cell

function of cell membrane

controls what enters and leaves the cell

Phospholipid bi-layer

1.Separates a cells content from the exterior environment 2.Regulates the transport of materials in and out. 3. Aides in the protection of the cell


Major content of Cell Membrane

Integral Proteins

Transports materials across membrane (Salts, Oxygen, Water, Sugar and Amino Acids)


Keeps cell membrane fluid (If were not in membrane there would be no diffusion)

Carbohydrate Chains

Recognizes stuff outside the cell

Selectively Permeable

Letting certain substances diffuse through, while at the same time preventing other substances from entering the cell.

Oxygen, Salts, Amino Acids, Water, Sugar

Molecules that enter

Urea, Carbon Dixoide

Molecules that leave


Process by which molecules move from areas of higher concentrations go to lower concentrations


When diffusion is equal on both sides

Simple Diffusion

Molecules move across a membrane


Diffusion of water across a membrane

Facilitated Diffusion

Transportation of molecules across a membrane with the help of a integral protein


Substance being dissolved in a solution


Substance doing the dissolving in the solutions; universal solvent is water

Hypertonic Solution

The solution with the greater concentration of solutes

Hypotonic Solution

Solution of equal solute concentrations

Active Transport

Movement of substance from low to high


Celluar absorption of molecules outside the cell by regions of the cell membrane


Taking in a large molecule (eating it)


Taking in small particles and dissolve ions


Expulsion of celluar material through the membrane using a vacuole

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