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“Materials move across the cell’s membranes”
Section 2.3
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Do Now What is the purpose of the cell membrane in a cell?
What goes in and out of our cells? Why are our membranes important?
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Objectives To explain the different functions of the macromolecules in the plasma membrane. To understand the process of diffusion. To compare and contrast active and passive transport.
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Membranes “Fluid Mosaic Model”
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Membrane Components Phospholipids:
Gives the general structure of the membrane
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Membrane Components Proteins: allow bigger substances to pass through, also provide structure
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Membrane Components Cholesterol: helps maintain structure of phospholipids, prevents them from sticking
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Membrane Components Carbohydrates: receptors that send and receive signals.
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Simulation Activity Everybody Stand up!!! Lets make a membrane out of the desks. I need 4 volunteers (1-H2O, 3-Glucose)
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Do Now What is diffusion? What is osmosis?
How did you lab show osmosis happening?
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Types of Transport across a cell membrane
Passive Transport Active Transport Vesicular Transport
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Passive Transport Do NOT require energy
Go from an area of high concentration to an area of low concentration “Go with the flow”
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3 Types of Passive Transport
Diffusion Facilitated Diffusion Osmosis
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Diffusion Molecules move from a high concentration to a low concentration to create DYNAMIC EQUILIBRIUM.
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Effected By… Heat- higher temp increases rate State of Matter
Solid- slow Liquid- faster Gas- fastest Size and Concentration Bigger= slower More concentration = faster
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Perfume Demo Before After
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Food Coloring Demo Before After
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Do NOW Explain what happens when you put a sugar cube in your tea in regards to diffusion.
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Objectives To understand how the process of Osmosis works.
To explain the different types of solutions To compare and contrast endocytosis vs. exocytosis.
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Facilitated Diffusion
the molecules need a “helper” or “facilitator” to allow them to cross the membrane when they are too big.
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Osmosis The flow of WATER from a high concentration to a low concentration Occurs based on the types of solutions you are working with.
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Solution A) a mixture in which you cannot separate the components (ex: Kool aid) i. solute: the substance being dissolved Ex: kool aid powder Ii. solvent: The substance doing the dissolving Ex: water
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Do Now I like to make ice tea using ice mix and water. Identify the: 1. Solute: 2. Solvent: 3. Solution:
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Solutions Solutions can be… Isotonic Hypertonic hypotonic
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Isotonic Solutions Same amount of solute inside the membrane as there is outside. Cell in this solution: NOTHING Plant Cell Blood Cell 11,397x
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HYPERtonic Solutions More solute, less water
Cell in this solution:shrinks/shrivels “Plasmolysis” “Crenates”
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HYPOtonic Solutions Less solute, more water
Effect: cell swells or bursts! /
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Do Now High or low Solute?
Cell in ________ Solution Cell in ________ Solution Cell in ________ Solution H2O H2O H2O
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Do Now Write where there is high water and high solutes.
Cell in hypotonic Solution Cell in isotonic Solution Cell in hypertonic Solution H2O H2O H2O
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Do Now For the following examples: Which way is the water moving?
What kind of cell solution (outside)? What is going to happen to the cells? A. B. C. 12% Salt 9% Salt 28% Salt 18% Salt 2% Salt 3% Salt
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Scenario 3 Your garden is infested with slugs so you go around pouring salt on them What type of solution is this salt? What is going to happen to the cells of the slug? (don’t do this to the poor slugs )
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Practice By yourself or with a partner (anyone), work on the diffusion problems. First try to do this by yourself, then verify your answers with a partner. Try to help each other. If you are confused, raise your hand and I will come help you!! If you finish early, please pick up a copy of your homework. THIS WILL BE GRADED.
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Do Now What is passive transport? What is an isotonic solution?
What is a hypertonic solution? What is a hypotonic solution?
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DO NOW A patient is given an IV, which contains the perfect balance of glucose What type of solution is in the IV? What is going to happen to the cells of the human?
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Objectives To compare and contrast active transport vs. passive transport To explain the process of endocytosis and exocytosis To determine the difference between pinocytosis and phagocytosis.
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A salt water fish is put into a freshwater aquarium.
DO NOW A salt water fish is put into a freshwater aquarium. What type of solution is the freshwater? What is going to happen to the cells of the fish?
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For the following examples:
A. Label the types of solutions inside the cell and outside the cell (hypertonic, isotonic, hypotonic) B. Where is the water going to move? C. What will happen to that cell? (Use vocab words!)
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Active Transport when molecules move from a low concentration to a high concentration and must use ENERGY. Example- Sodium Potassium Pump
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Vesicular Transport Sometimes things enter and exit the cell by forming vesicles. For example… Endocytosis: When cells absorb molecules by engulfing them. (like pacman)
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Endocytosis Pinocytosis: when the substance being engulfed is a LIQUID. Phagocytosis: when the substance being engulfed is a SOLID.
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Vesicular Transport Exocytosis: When cells expel unwanted materials from vesicles.
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Vesicular Transport
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