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43 terms

Diffusion

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osmosis
the movement of water molecules from an area of high concentration to low concentration
solute
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
solution
A homogeneous mixture of two or more substances
homogeneous
Uniform in structure or composition throughout
semipermeable membrane
A membrane that will let some substances through, but not others
lyse
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.
diffusion
the movement of molecules from an area of higher concentration to an area of lower concentration
homeostasis
the maintenance of stable internal conditions despite changes in the surroundings
hydrophobic
repels water
hydrophyllic
water loving phosphate head
solvent
a substance that dissolves another substance
wilting
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.
elodea
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
Phospholipids
Major content of Cell Membrane
Integral Proteins
Transports materials across membrane (Salts, Oxygen, Water, Sugar and Amino Acids)
Cholesterol
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
Diffusion
Process by which molecules move from areas of higher concentrations go to lower concentrations
Equilibrium
When diffusion is equal on both sides
Simple Diffusion
Molecules move across a membrane
Osmosis
Diffusion of water across a membrane
Facilitated Diffusion
Transportation of molecules across a membrane with the help of a integral protein
Solute
Substance being dissolved in a solution
Solvent
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
Endocytosis
Celluar absorption of molecules outside the cell by regions of the cell membrane
Phagocytosis
Taking in a large molecule (eating it)
Pinocytosis
Taking in small particles and dissolve ions
Exocytosis
Expulsion of celluar material through the membrane using a vacuole