Presentation on theme: "6.3 Transport. What do you predict will happen if food coloring is dropped into a beaker of water? Where are the molecules most concentrated to start?"— Presentation transcript:
What do you predict will happen if food coloring is dropped into a beaker of water? Where are the molecules most concentrated to start? Where are the molecules less concentrated to? What is Diffusion? The movement of molecules from a high concentration to a low concentration. 6.3 Transport: Predict the results
KEY CONCEPT Materials move across membranes because of concentration differences. What is a concentration gradient? Molecules move down a concentration gradient. Think of a slide. Would energy be required? 6.3 Transport
How is Diffusion Important for cells or your Body? For Cellular Transport Medications, digestion, oxygen, carbon dioxide.
Passive transport : Molecules can move across the cell membrane through passive transport. Does not require energy input from a cell. There are three types of passive transport. Osmosis Facilitated diffusion Simple diffusion 6.3 Passive Transport
Diffusion and osmosis are types of passive transport. Osmosis is the diffusion of water molecules across a semipermeable membrane. 6.3 Osmosis
Diffusion and osmosis are types of passive transport. There are three types of solutions. isotonic 6.3 Osmosis Solutions hypotonic hypertonic
Some molecules can only diffuse through transport proteins. Some molecules cannot easily diffuse across the cell membrane. Facilitated diffusion is diffusion through transport proteins. Facilitated Diffusion
Facilitated diffusion: Diffusion of larger molecules through the protein channels in the cell membrane. Passive transport- no energy needed. Molecules move from ____ conc. to ____ conc. Examples include: glucose, water, ions.
Active Transport: Movement of molecules from______ conc. to ______ conc. Requires energy (ATP) Needs transport proteins Examples- Na/K pump, endocytosis, exocytosis.
Transport of Large Molecules: Vesicles used- small membrane sacs; move products into, out, or within a cell. Exocytosis- Materials leave a cell. vesicle containing the protein fuses with the plasma membrane and spills its contents outside the cell. Example- release of insulin Endocytosis-Takes material into the cell. vesicles bud inward from the plasma membrane Examples- phagocytosis (solids)