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T2-Cell Systems L3

T2-Lesson 3 Obtaining and Removing Materials

Moving Materials into and out of the cell- A. CELL MEMBRANE 1. Helps cells maintain homeostasis. 2. Not rigid; flexible 3. Made up of carbohydrates, proteins, lipids. 4. Selective Permeable 5. Passive Transport 6. Active Transport
Selective Permeable Allows some things to freely pass, and some things to not pass at all (or less freely).
B.PASSIVE TRASPORT 1. Movement across a cell membrane WITHOUT the use of energy. 2. Diffusion -molecules move from an area of higher concentration to an area of lower concentration.
Passive Transport- Examples of Diffusion . a) EX. Lungs- oxygen easily diffuses into lungs because of concentration gradient. b) EX. Scent of a candle diffuse around the room
Passive transport- Osmosis 3. Diffusion of WATER across a selective permeable membrane. a) Soaked raisins/cells- become filled with water.
Passive Transpot- Facilitated Diffussion 4. Proteins provide a pathway for some molecules (sugar) to move through cell membrane.
C. ACTIVE TRANSPORT 1. Movement of materials across a cell membrane WITH the use of energy. 2. Molecules move from an area of lower concentration to an area of higher concentration. 3. Transport proteins "pickup" specific molecules & carry them across the membrane-
ACTIVE TRANSPORT Examples Calcium Potassium Sodium
D. MOVING LARGE PARTICLES 1. Some particles are too large to cross membrane (food). 2. Endocytosis 3. Exocytosis 4- Forms of active transport because they require energy.
Moving Large Particles- ENDOCYTOSIS Particles move INTO the cell.
Moving Large Particles- EXOCYTOSIS Particles move OUT of the cell
Summary- Moving Material INTO and OUT of the Cell Cell Membrane Positive Transport Osmosis Active TRansport Moving Large particles
Created by: pinedaK
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