Vocabulary Active Transport 2 Passive Transport 3 Simple

Vocabulary Active Transport 2. Passive Transport 3. Simple Diffusion 4. Osmosis 5. Facilitated Diffusion 6. Tonicity 7. Hypotonic solution 8. Hypertonic solution 9. Isotonic solution 10. Endocytosis 11. Exocytosis 1.

Here’s What We Wanna “Get. ” 1. 2. What are the two major types of cell transport (CT), and what distinguishes them from each other? What type of CT is each of the following: diffusion, active transport, endocytosis, osmosis, and exocytosis?

Your Essential Questions are… 1. 2. 3. What sort of “stuff” moves into and out of cells? Why is the movement of this “stuff” crucial to the survival of an organism? How does this stuff get in there…or out of there?

What Do Cells Do Anyway? Ok…now you know what classifies something as “LIVING; ” what all living things need; and all about cell theory…what exactly is going on inside of those cells? You’re not writing all of this down…are you?

Transport…Movement fromplace to place. u Intercellular-from cell to cell. Involves going through the cell membrane. u Intracellular-ER, Golgi, Microtubules, Microfilamments…u know…that stuff.

How Do Substances Get In and Out of Cells (intercellular transport)? u The first thing to understand is that the cell membrane is what controls what goes in and out of cells. u It can do this because it is…get ready for a big word…SELECTIVELY PERMEABLE. u Selective…as in…its choosey u Permeable…as in…stuff can go through it…but only certain stuff. u This is a chemical choosiness.

Here’s Something You Need to Understand… u Substances (stuff) naturally move from HIGH CONCENTRATION to LOW. This is because atoms and molecules are always moving and bumping into each other. If its hot they move faster; If its cooler they move more slowly. u As they collide (bump), they keep spreading out until they’re evenly distributed aka…EQUILIBRIUM (that’s a sciency word for evenly spread out). u

Two Main Processes…and their friends 1. u u u Passive Transport- requires NO ADDITIONAL ENERGY input. Simple Diffusion: molecules move from high concentration to low concentration (a lot of stuff to less stuff). Osmosis: a special type of diffusion in which water moves through a semipermeable membrane. Facilitated Diffusion: some stuff just can’t get through the membrane without a little help. Carrier and channel proteins (like permeases) are happy to lend a hand.

2. Active Transport-REQUIRES INPUT of additional ENERGY. Involves movement of molecules from low concentration to high concentration (a lot of stuff). And that ain’t easy! u u Endocytosis, aka Engulfing (phagocytosis/pinocytosis): the cell membrane “swallows” an outside particle and pinches off. This forms a vacuole. Exocytosis…a vesicle forms around an unwanted molecules, attaches to the cell membrane, and…out it goes.