Cell Transport Essential Questions Differentiate passive and active transport. What is the difference between diffusion and osmosis.

Passive Transport

I. ___________: An organism tries to maintain a stable internal environment by ________ what ______ and _____ the cell. This is the function of the _____________. It is ___________________________________. Homeostasis regulating enters leaves cell membrane semipermeable or selectively permeable Wastes CO2 Excess water Food Oxygen Water Cell

II. The cell membrane is a double layer called a __________. lipid bilayer

III. ______________ A. Cell use ___________. (Like moving _______) Passive Transport NO ENERGY downhill B. Molecules move from an area of ____ concentration to an area of ___ concentration High Low High Low

C. Examples 1. ________: The movement of _________ from an area of _____ concentration to an area of ___ concentration. Diffusion molecules high low 2. ________: The movement of _____ though a ____________________ membrane from an area of ____ concentration to an area of ___ concentration Osmosis water selectively permeable high low 3. ________________ uses transport proteins to move other ions and small molecules across the plasma membrane. Substances move through a transport protein called ______________ that opens and closes to allow substances to diffuse through the membrane Facilitated diffusion channel protein

A cell is A cell is A cell is placed in a placed in an placed in a _________ _______ _________ solution solution solution Hypertonic Isotonic Hypotonic (solution with equal solute concentration with that of the cell) (solution with more solute than the cell (solution with less solute than the cell) Water salt (solute-dissolved substance) Water Salt (solute) Water salt (solute) water water water Cell shrinks Water moves in and out of the cell at an equal rate. -- DYNAMIC EQUILIBRIUM Cell swells and bursts

Active Transport

a. A cell uses ______ =___. (Like moving _____) energy ATP uphill IV. _______________ Active Transport a. A cell uses ______ =___. (Like moving _____) energy ATP uphill b. Molecules move from an area of _____ concentration to an area of ____ concentration. low high low high ( Do not reach ___________) equilibrium

C. Examples 1. __________ (_____): The cell takes __ material by forming a pouch (________) around the substance. Endocytosis enter in vacuole

2. _________ (___): A cell moves a substance to the _______ of a cell using a vacuole. Exocytosis exit outside