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Structure (Plasma Membrane) A lipid bilayer(2 layers of lipids) with a variety of proteins
Lipid molecule Proteins
Identify the lipid molecules. Identify the protein molecules. What is a ‘lipid bilayer’?
Function - To be Selective Permeable: = control what passes in or out of the cell (Plasma Membrane) -Helps maintain Homeostasis: = maintain a stable internal environment
- Act as a lining, separates the chemicals of the cytoplasm from the surroundings What the lipids do…
(Plasma Membrane). 1. Form a. open channels b. gated channels c. active transport pathways, All to move molecules in & out of the cell! What the proteins do…
Open channels Ex. 1 of channel proteins.
Gated channel Ex. 2 of channel proteins.
(Plasma Membrane) - - Receptors that change cellular activity. Protein Function #2
Receptor protein Signal molecule
Change cellular activity
(Plasma Membrane) - - Create a molecular mark (signature) that identifies that specific, individual cell. Protein Function #3
Types of particle that might cross membranes. Tiny molecules, like… Water Oxygen & Carbon dioxide
Types of particle that might cross membranes. Small molecules, like… Glucose, amino acids, fatty acids and glycerol
Water Carbon Dioxide Oxygen Aminoacid Glycerol Glucose Fatty Acid
Yet more types of particles that might cross cell membranes! Yes, even large molecules, such as… Polysaccharides Lipids & proteins!
Lipid soluble molecules Fats, Fatty acids
Charged particles ions Na+, K +, Cl +
Even Large Particles may sometimes cross the selectively permeable cell membrane! Such as… small organisms and Organic debris
Diffusion Movement of particles from an area of high concentration to an area of lower concentration.
Diffusion requires a Diffusion requires a Concentration gradient When the concentration of particles is not the same throughout a mixture.
Concentration Gradient There is a region of high concentration and a region of low concentration.
Go to page 7 in the note packet and learn about the use of square brackets. [ ]
Do the activity The Tea Cup & The Swimming Pool on page 8.
Equilibrium When the concentration of particles is the same throughout a mixture.
Equilibrium There is no region of high, nor a region of low concentration of particles.
Equilibrium All particle continue to move.
TRANSPORT The Movement of Materials Across Membranes
Passive Transport Materials move down the concentration gradient and across a membrane.
What determines if a particle can go through a channel?
Osmosis The passive transport of water across a membrane.
Thistle Tube Demo
water molasses thistle tube Selectively permeable membrane
Active Transport Particles move Across a SPM. theAgainst the concentration gradient. The cells must spend energy.
Active transport allows particles to move against the concentration gradient. (from an area of _____ concentration to an area of ___ concentration) HIGH LOW
An example of Active Transport: All animal cells have a Sodium Potassium pump that pumps sodium (Na +) to the outside of cells and potassium (K +) to the inside of cells.
This ‘pump’ allows nerve cells to carry electrical messages through the body! Nerve cell
The Cell Membrane of a nerve cell
Endocytosis Particles move INTO the cell by folding a portion of the membrane around a particle, resulting in a vesicle.
There are two types of Endocytosis: Pinocytosis - drinking Dissolved materials Phagocytosis - eating Food particles
Pinocytosis The solute particles are too small to see but too big to pass through the membrane.
Exocytosis Particles move OUT OF a cell by fusing vesicles with the cell membrane.
Maintaining water balance in Protists
Facilitated Transport (Facilitated Diffusion) -Diffusion using protein channels
Types of Cellular Transport Passive Transport cell doesn’t use energy 1.Diffusion 2.Facilitated Diffusion 3.Osmosis Active Transport cell does use.
Section 4-1 What is homeostasis? Cells maintain homeostasis by controlling the movement of substances across the cell membrane.
Cell Membrane Transport Notes Cell Membrane and Cell Wall: ALL cells have a cell membrane made of lipid bilayer and proteins Cell Membrane lipid bilayer.
CELL TRANSPORT Chapter 4. CELLS AND HOMEOSTASIS How do cells maintain homeostasis? Cell membrane controls the movement of substances in and out of the.
Chapter 5 Membranes and Transport. Cell Membrane Function: To control passage of substances Selectively permeable: Some substances and chemicals can pass.
Why is the cell membrane so important???. Names! Cell membrane Plasma membrane Selectively permeable membrane Semi permeable membrane.
Getting In & Out of a Cell Osmosis & Diffusion Getting In & Out of a Cell Osmosis & Diffusion.
Cells and Their Environment Objectives: 1. Relate concentration gradients, diffusion, and equilibrium. 2.Describe the importance of ion channels in passive.
Chapter 2 Lesson 3 Moving Cellular Materials. Cell Membrane The cell membrane is selectively permeable ◦ It allows certain things into the cell while.
Lesson 2: Cell Transport-Passive and Active. Describe different types of passive transport. Explain how different types of active transport occur.
Cellular Transport Notes. The Purpose of the Plasma Membrane is to Maintain Balance called “HOMEOSTASIS” or “To Reach Dynamic Equilibrium”” Is traffic.
Passive and Active Transport Movement of material into and out of cells.
EQ: EXPLAIN HOW ACTIVE AND PASSIVE TRANSPORT HELP THE CELL MAINTAIN HOMEOSTASIS. SC B-2.5 EXPLAIN HOW ACTIVE, PASSIVE, AND FACILITATED TRANSPORT SERVE.
Cellular Transport Movement of Materials In and Out of a Cell.
Cell Transport. What can cross the cell membrane easily? 1) Hydrophobic molecules- like lipids, carbon dioxide, and oxygen can dissolve in membrane and.
Homeostasis and Cell Transport 5.1 Passive Transport 5.2 Active Transport.
Cells and Their Environment. Cell membranes – function to communicate between neighboring cells. They also serve as a selectively permeable barrier. It.
1 Transport through cell membranes. Cell Membrane.
Transport: Passive and Active. Structure of Cell membranes Fluid not rigid Selectively permeable Made of a phospholipid bilayer Embedded with proteins.
Cell Transport Crossing the Plasma Membrane. Plasma Membrane Phospholipid bilayer with proteins and cholesterol molecules scattered throughout Selectively.
Biology Chapter 8 Cells and Their Environment. Sodium-Potassium Pump Carrier protein that uses ATP as it moves potassium ions and sodium ions across the.
Cell Membrane (Transport) Notes Cell Membrane and Cell Wall: ALL cells have a cell membrane made of proteins and lipids Cell Membrane lipid bilayer protein.
Biology. Cell Membranes and Homeostasis Passive Transport Diffusion Facilitated Diffusion Osmosis Active Transport Molecular Transport Bulk Transport.
Transportation of Materials Across the Cell Membrane 1.
1 The Plasma Membrane The Plasma Membrane - Gateway to the Cell.
Types of Cellular Transport Passive Transport Does NOT require energy cell doesn’t use energy 1.Diffusion 2.Facilitated Diffusion 3.Osmosis Active.
CHAPTER 8 CELLS & THEIR ENVIRONMENT Review: Cell (or plasma) membrane – is composed of a lipid bilayer with embedded proteins that float. The cell membrane.
CELLULAR TRANSPORT SBI 3C SEPTEMBER PASSIVE TRANSPORT: Transport that does not require energy. Important Terms: Dynamic equilibrium: A state.
1. What is a solute? 2. What is a solvent? 3. What is diffusion and osmosis? 4. What does it mean to be active? 5. What does it mean to be selective? 6.
1 The Plasma Membrane The Plasma Membrane - Gateway to the Cell copyright cmassengale.
Cellular Transport Notes. The Purpose of the Plasma Membrane is to Maintain an Internal Balance called “HOMEOSTASIS” or “To Reach Dynamic Equilibrium””
Chapter 4 Cells and Their Environment Section 1: Passive Transport Section 2: Active Transport.
1 Cell Membrane controls Homeostasis ___________It balances the ___________ and _________ of the cell. ___________ is maintained by plasma membrane controlling.
Chapter 4 Notes Cell Physiology Biology Hamilton Science Department.
Copyright Pearson Prentice Hall Homeostasis & Membrane Transport.
1 Homeostasis Balanced internal condition of cells Also called equilibrium Maintained by plasma membrane controlling what enters & leaves the cell.
Cell Membrane Outside of cell Inside of cell (cytoplasm) Cell membrane Proteins Protein channel Lipid bilayer Carbohydrate chains.
Cell transport 7.3. Key Questions 1.What is passive transport? 2.What is active transport?
CELL TRANSPORT Cell membranes are similar to a mesh bag or a screen on a window.
Answer the following questions for the picture. Write the ANSWER only. 1. _________ is the movement of water. 2. _______ ________ requires energy to move.
Transport-cell membrane Do Now : What is homeostasis? What is transport? Brainstorm : Can you brainstorm one way that transport helps to maintain homeostasis.
Cell Membrane Selectively Permeable. Basic Structure Double layer of phospholipids Referred to a bilayer A phospholipid has a head and two tails The phospholipids.
Cellular Transport. Diffusion Maintaining homeostasis – Cell membranes help organisms maintain homeostasis by controlling what substances may enter or.
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Movements Through Cell Membranes.
Cell Membrane What is it? – Barrier that separates cell from external environment – Composed of two phospholipid layers Other molecules are embedded in.
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