Cell Transport Membranes Structure and Function. Membrane Structure Phospholipid Bi-layer Phospholipid Bi-layer Contains Different Types of Proteins Contains.

Slides:



Advertisements
Similar presentations
Section 3-3, 3-4, 3-5 “Movement across the cell membrane”
Advertisements

Cells and Their Environment
Fluid Mosaic Model Structure can be observed with EM
1 The Plasma Membrane The Plasma Membrane - Gateway to the Cell.
Maintaining Cellular Homeostasis How do organisms regulate their body’s internal environment?
The Cell Membrane. Overview Cell membrane separates living cell from nonliving surroundings – thin barrier = 8nm thick Controls traffic in & out of the.
4.1 Plasma Membrane Structure and Function
CELL TRANSPORTATION Cell membranes are selectively permeable, controlling the entrance and exit of all nutrients, wastes and other molecules in order to.
Cell Membrane.
4-1 Chapter 4: Membrane Structure and Function. 4-2 Plasma Membrane Structure and Function The plasma membrane separates the internal environment of the.
Passive and Active Transport
Structure and Function
The cell membrane has two major functions.
Cells and Their Environment
Homeostasis and Transport
Topic Membranes IB Biology - Period 5 Trevor Kosmo.
1 The Plasma Membrane The Plasma Membrane - Gateway to the Cell.
Types of Cellular Transport  Passive Transport cell doesn’t use energy 1.Diffusion 2.Facilitated Diffusion 3.Osmosis  Active Transport cell does use.
Dr Pradeep Kumar Professor, Physiology KGMU. The Plasma Membrane – a Phospholipid Bilayer.
Functions of the plasma membrane 1.Holds the cell together 2.Controls what goes in and out (diffusion, osmosis, active transport) 3.Protects the cell.
Human Biology Stage 3 Text: Chapter 2. Keywords Diffusion Osmosis Fluid mosaic model Phospholipid bilayer Hydrophobic Hydrophilic Channel proteins Carrier.
A Closer Look at Membranes Chapter 6. Cell Membrane Main Functions Controls Transport in & out of the Cell Cell membrane is selectively- permeable, meaning.
Types of Cellular Transport  Passive Transport  Does NOT require energy cell doesn’t use energy 1.Diffusion 2.Facilitated Diffusion 3.Osmosis  Active.
Structure of the Plasma Membrane Lipid bilayer – two sheets of lipids (phospholipids). – Found around the cell, the nucleus, vacuoles, mitochondria, and.
Facilitated Diffusion Active Transport
Transport: Passive and Active. Structure of Cell membranes Fluid not rigid Selectively permeable Made of a phospholipid bilayer Embedded with proteins.
Transport Across the Cell Membrane
Cell Membrane. Hydrophilic Hydrophobic Hydrophilic.
Cell Membrane & Transport Censational Review. Name the molecule with a polar “head” and two nonpolar “tails”. Name the molecule with a polar “head” and.
Cell Membrane Notes. Make up of the Cell Membrane Phospholipid bilayer - Two layers of charged lipids face each other, Only small particles with no charge.
CELL BOUNDARIES The Cell Membrane and Transport Processes.
Ch. 5- Membrane Structure and Function. Components of the Plasma Membrane  Phospholipid bilayer  Protein Molecules that are either partially or wholly.
Passive Transport vs. Active Transport. Remember that all cells have … Plasma or cell membranes that are selectively permeable and very fluid… (Click.
Cell Membrane What is it? – Barrier that separates cell from external environment – Composed of two phospholipid layers Other molecules are embedded in.
Cell Membrane Notes. Diffusion – particles move from an area of high concentration to low concentration in other words: particles spread out
Active vs. Passive Transport FA Learning Goal: Compare and contrast active and passive transport.
Passive vs. Active Transport. Passive Transport Does NOT require energy Moves substances from higher to lower concentration.
Passive vs Active Transport Osmosis, Diffusion, and Energy.
Membranes. Phospholipids Have two regions, with different properties: 2 hydrocarbon tails which are Hydrophobic A phosphate head, that is negatively charged.
Cellular Transport Molecules moving across the cell membrane Cell Membrane is selectively permeable (lets some things in, some things out, but not everything)
Movement Through the Membrane Mr. Luis A. Velázquez Biology.
Biology Warm-Up 1. What is the function of the cell membrane? 2. What is the cell membrane composed of? Learning Goal  Understand the relationship between.
Topic 2.4 MEMBRANES Draw and Label a Membrane cholesterol.
Cell Transport Crossing the Plasma Membrane. Plasma Membrane Phospholipid bilayer with proteins and cholesterol molecules scattered throughout Selectively.
4.1 Plasma Membrane Structure and Function Regulates the entrance and exit of molecules into and out of the cell Phospholipid bilayer with embedded proteins.
1 The Plasma Membrane The Plasma Membrane - Gateway to the Cell copyright cmassengale.
Transport Across Membranes. The Plasma Membrane A selectively permeable phospholipid bilayer with integrated proteins.
Passive Transport vs. Active Transport. Remember that all cells have … Plasma or cell membranes that are selectively permeable and very fluid…
Biology 9/10/13 Warm-Up What is the function of the cell membrane?
Cell membranes are composed of two phospholipid layers.
Diffusion 2nd Law of Thermodynamics governs biological systems
Cell Transport.
“Active” Cellular Transport
Structure Function Activity
The Cell Membrane and Transport Processes
CELLULAR TRANSPORT.
The Cell Membrane Mader Biology, Chapter 5.
The Cell Membrane Mader Biology, Chapter 5.
Plasma Membrane Structure and Function
The Cell Membrane and Transport Processes
Structure of the Cell membrane
Membrane Structure and Transport
More than just boundaries….
Cell membranes are composed of two phospholipid layers.
Movement Through a Membrane
Inquiry into Life Eleventh Edition Sylvia S. Mader
P Transport.
C-Notes: Cell Membrane (Plasma Membrane)
Cells and Their Environment
Chapter 7 – Cell Structure & Function
Presentation transcript:

Cell Transport Membranes Structure and Function

Membrane Structure Phospholipid Bi-layer Phospholipid Bi-layer Contains Different Types of Proteins Contains Different Types of Proteins –Channel proteins –Protein Pumps proteins –Adhesion proteins –Cell-to-Cell Communication proteins –Hormone Receptor proteins –Immobilized Enzymes Fluid Mosaic Model Fluid Mosaic Model

Phospholipid Bi-layer Contains Glycoproteins Glycoproteins Integral Proteins Integral Proteins Peripheral Proteins Peripheral Proteins Cholesterol Cholesterol

Channel proteins Integral protein: embedded across bi-layer Integral protein: embedded across bi-layer Allows for movement of molecules across cell membrane Allows for movement of molecules across cell membrane

Membrane Function Boundary Separates Two Environments Boundary Separates Two Environments Selectively Permeable Selectively Permeable Passive Transport Passive Transport –Simple Diffusion –Facilitated Diffusion Active Transport Active Transport –Protein Pumps Endocytosis / Exocytosis Endocytosis / Exocytosis

Selectively Permeable Membranes and their proteins allow only certain molecules to cross Membranes and their proteins allow only certain molecules to cross Diffusion: movement of a substance from an area of high concentration to low concentration Diffusion: movement of a substance from an area of high concentration to low concentration Osmosis: movement of water from an area of low solute concentration to high Osmosis: movement of water from an area of low solute concentration to high

Diffusion

Osmosis

Passive Transport The movement of a molecule across a membrane from high to low concentration Molecules move with the concentration gradient Simple Diffusion Simple Diffusion –No proteins needed Facilitated Diffusion Facilitated Diffusion –Membrane proteins required

Simple Diffusion Small, uncharged molecules can move directly across membrane Small, uncharged molecules can move directly across membrane Includes gases (CO 2 and 0 2 ) and water Includes gases (CO 2 and 0 2 ) and water

Facilitated Diffusion Uses either protein channels or transporters (change shape) Uses either protein channels or transporters (change shape) ChannelTransporter

Passive Transport

Active Transport Movement of molecules across a membrane from low concentrations to high Movement of molecules across a membrane from low concentrations to high Molecules move against the concentration gradient Molecules move against the concentration gradient Requires a protein transporter (pump) and energy supplied by ATP Requires a protein transporter (pump) and energy supplied by ATP Ex. sodium/potassium pump Ex. sodium/potassium pump

Active Transport

Passive Vs. Active Transport

Endocytosis Cell membrane surrounds and engulfs food particle or extra-cellular fluid Cell membrane surrounds and engulfs food particle or extra-cellular fluid Results in vesicle inside cell Results in vesicle inside cell Phagocytosis: engulfing large particles like bacteria Phagocytosis: engulfing large particles like bacteria Pinocytosis: engulfing extra-cellular fluid and whatever it might contain Pinocytosis: engulfing extra-cellular fluid and whatever it might contain

Exocytosis Opposite of endocytosis Opposite of endocytosis Vesicle containing secretory proteins or wastes joins with plasma membrane Vesicle containing secretory proteins or wastes joins with plasma membrane Molecules inside vesicle are then released outside of the cell Molecules inside vesicle are then released outside of the cell

Summary