Transport notes I.Passive transport ex. II.Facilitated diffusion ex. III.Active transport ex. A. Endocytosis 1. pinocytosis 2. phagocytosis B. Exocytosis.

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Presentation transcript:

Transport notes I.Passive transport ex. II.Facilitated diffusion ex. III.Active transport ex. A. Endocytosis 1. pinocytosis 2. phagocytosis B. Exocytosis IV. Cell specialization

Section 8.1 Summary – pages Transport of Materials Passive transport--Movement of molecules across a membrane using no energy. Occurs from higher to lower concentration Ex. water Concentration gradient Plasma membrane

Section 8.1 Summary – pages Section 8.1 Summary – pages Facilitated diffusion--Passive transport with the help of transport proteins which open up like gates or form channels. Occurs from high to low concentration Ex. Sugars and amino acids Plasma membrane Channel proteins Concentration gradient Transport of Materials

Section 8.1 Summary – pages Section 8.1 Summary – pages Transport of Materials Active transport--Movement of materials through a membrane that requires energy. Occurs from lower concentration to higher concentration (against the concentration gradient) Ex. minerals Plasma membrane Concentration gradient Carrier proteins Cellular energy Step 1Step 2

Section 8.1 Summary – pages How do large materials enter and exit cells? Endocytocis—When materials enter a cell; cell surrounds particles Endocytosis Exocytosis Digestion Nucleus Wastes

Section 8.1 Summary – pages Section 8.1 Summary – pages Transport of Large Particles Example--White blood cell engulfing bacteria

Two types of endocytosis: Pinocytosis: movement of fluids into a cell; cell “drinking” Phagocytosis: movement of solids into a cell; cell “eating”

Section 8.1 Summary – pages Transport of Large Particles Exocytosis—when materials exit a cell or are expelled from the cell Endocytosis Exocytosis Digestion Nucleus Wastes

Section 8.1 Summary – pages Transport of Large Particles Example--Cell getting rid of waste

What does it mean by saying that a cell is specialized? Cell specialization: Cells perform different functions within a multicellular organism –Ex. Red blood cells carry oxygen pancreatic cells produce insulin

Review Questions: What is the difference between diffusion and osmosis? What are two differences between passive and active transport? What is the difference between endocytosis and exocytosis?