CELLULAR TRANSPORT NOTES:
Cell Membrane (AKA PLASMA MEMBRANE)

Controls the _______________________________ of molecules _______ and ___________ of the cell

Selective ___________________________________
Selective Permeable: A membrane only certain things can pass through
Selectively (adverb): Chooses some things but not others)
Permeable (adjective): Has small openings that things can travel through
ALL CELLS ________________________ MATERIALS IN AND OUT OF THE CELL
TYPES OF TRANSPORT: (2 ways chemicals enter the cell)
1. Passive: ________________________________________________________________________
2. Active: __________________________________________________________________________
1. Passive Transport: particles ________________________________________________________easily
“down the concentration gradient”
Two- sub-types:
i.
Osmosis: movement of liquid (______________________________________)
across a cell membrane.
ii.
Diffusion: movement of small particles from an area of ____________________
concentration to an area of _____________________ concentration.
Solution Types:
Hypotonic Solution: Solute concentration is _________________ inside the cell, the water
concentration is ________________outside of the cell.
Net Movement= Water ___________________ the cell (CAN CAUSE CELL TO BURST)
Hypertonic Solution: Solute concentration is ____________________ outside the cell, the water
concentration is _______________________ inside the cell.
Net Movement= Water ______________________ the cell. (CAN CAUSE CELL TO CRINKLE)
Isotonic Solution: Solute and water concentrations are both __________________________ on
both sides of the membrane. (EQUALIBRIUM)
Concentration: the number of a substance in a _________________________________________
High Concentration
Low Concentration
Examples: C02, water, oxygen,
1. Cells getting rid of CO2
2. Cells taking in 02 for cellular respiration
3. Water moving across the cell membrane when needed or as a waste product
Channel Proteins _______________ specific molecules through. Channel Proteins change shape
to allow certain molecules through the membrane (NO ENERGY USED)
2. Active Transport: movement of material from _____________ concentration to
__________________ (AGAINST _______________________________________GRADIENT)
using a protein carrier that _________________________________(Cost ATP/ Cell has to work for it)
High Concentration
Low Concentration
If large particles need to enter or leave the cell, they require special types of active
transport called ______________________________or _____________________________________________
Endocytosis occurs when a cell needs to bring in _______________particles. Think
about “________________________” sounding like “___________________________” cell.
Exocytosis occurs when a cell needs to take out large particles. Think about
“_________________” sounding like “_________________” the cell. This is how the Golgi ships
proteins out of the cell.
Examples: sodium potassium pump, proteins
1. Cells bringing in large food particles
2. Cells releasing waste
3. White blood cells “eating pathogens”