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Understanding Cell Transport Mechanisms: Active and Passive Transport Explained

In this lesson, we will explore the structure and function of cells, focusing on transport mechanisms. Students will complete an Egg Osmometer lab while discussing active transport processes like the Sodium-Potassium pump and endocytosis types (phagocytosis and pinocytosis). Additionally, we’ll create a mind map summarizing various transport methods, including osmosis, facilitated diffusion, and exocytosis. The class will build a solid understanding of how substances move across cell membranes, preparing for the upcoming project due on 10/16/13.

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Understanding Cell Transport Mechanisms: Active and Passive Transport Explained

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  1. Tuesday, October 8, 2013 “Nothing will work unless you do.” ~ Maya Angelou S.C. Standards for Today: B-2: The student will demonstrate an understanding of the structure and function of cells and their organelles. Today’s Objectives: • Cell Rubric • Finish Egg Osmometer Lab • Discuss Active Transport • Create a Mind Map on the different types of transport Reminder: Cell Project Due 10/16/13! Warm Up: • What are the three types of passive transport? • What is the function of the lysosome? • What happened to your jar full of beans and sand?

  2. Active Transport

  3. Transport of molecules againsta concentration gradient (from regions of low concentration to regions of high concentration) with the aid of proteins in the cell membrane and energy from ATP Active Transport

  4. Carrier proteins move substances from low concentration to a higher concentration Ex: Sodium-Potassium Pump • 2 Na+ pumped out of the cell • 2K+ pumped into the cell Cell Membrane Pumps

  5. Sodium Potassium Pump

  6. Importing larger quantities of materials by infoldings of the cell membrane • Phagocytosis: “cell eating” • Cell membrane surrounds the food and buds off a vacuole. Lysosomes then secrete enzymes into a vacuole to digest food Endocytosis

  7. Endocytosis

  8. Importing larger quantities of materials by infoldings of the cell membrane • Pinocytosis: “cell drinking” • Smaller infoldings allows droplets of liquid to enter Endocytosis

  9. Large quantities of substances exiting the cell • Dumping of excretions or wastes outside • Secretion of products needed elsewhere (example: new proteins, hormones, etc.) Exocytosis

  10. Exocytosis

  11. Active Transport

  12. Summary of Transport

  13. Create a mind map using the following words: • Endocytosis • Fusion of vesicle to plasma membrane • Pinocytosis • Facilitated Diffusion • Simple Diffusion • Hypertonic • Goes against gradient • Movement directly thru membrane • Non-polar and small polar substances • Uses transport proteins • Movement of water through a semi-permeable membrane • Isotonic • Active • Phagocytosis • Solids • Liquids • Exocytosis • Na/K pump • Requires ATP • Osmosis • Passive • Formation of vesicles from plasma membrane • Hypotonic Transport Mind-Map

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