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PASSIVE TRANSPORT CHAPTER 5 PGS 97-102 PASSIVE TRANSPORT • Movement across the cell membrane without energy. REVIEW: What characteristics does the cell membrane have? • Selectively permeable • Get rid of waste • Interact with the environment I. CONCENTRATION GRADIENT •Molecules have kinetic energy (they move) •Concentration Gradient: difference between high and low concentration • Molecules move “down” gradient •Equilibrium: when all molecules are evenly spread out DRAW THIS! II. TYPES OF PASSIVE TRANSPORT • Diffusion: movement across the cell membrane without energy II. TYPES OF PASSIVE TRANSPORT • Osmosis: special diffusion of water across membrane • Water moves where there are more solutes (solids) III. TYPES OF TONICITY 1. Hypotonic • More solutes inside the cell, water moves in • The cell swells Draw one of these Animal Cell Plant Cell III. TYPES OF TONICITY 2. Hypertonic • More solutes outside the cell, water moves out • The cell shrinks Draw one of these Animal Cell Plant Cell III. TYPES OF TONICITY 3. Isotonic • Equal solutes inside and outside • Cell stays the same, equal movement of water in and out of cell Draw one of these Animal Cell Plant Cell REAL LIFE APPLICATION IV. FACILITATED DIFFUSION • Molecules too big to move across the membrane use carrier proteins • Ex. Glucose
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