Membrane Dynamics
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This document provides an overview of cell membrane structures and functions. It discusses how membranes form fluid compartments that act as barriers while also regulating exchange. The membrane is made up of a phospholipid bilayer with integral and peripheral proteins. Transport proteins such as channels, carriers, and receptors facilitate movement of substances across the membrane. Structural proteins anchor the cytoskeleton and provide cell polarity, while carbohydrates form an external glycocalyx layer. In summary, the document outlines the key components and functions of the cell membrane, including its role in compartmentalization, transport, and communication.
Membrane Dynamics
- 1. Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings Dee Unglaub Silverthorn, Ph.D. HUMAN PHYSIOLOGY PowerPoint® Lecture Slide Presentation by Dr. Howard D. Booth, Professor of Biology, Eastern Michigan University AN INTEGRATED APPROACH T H I R D E D I T I O N Chapter 5, part A Membrane Dynamics
- 2. Copyright © 2004 Pearson Education, Inc., publishing as Benjamin CummingsCopyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings Membrane Dynamics • Membrane Dynamics visit us www.dentaltutor.in
- 3. Copyright © 2004 Pearson Education, Inc., publishing as Benjamin CummingsCopyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings About this Chapter • Cell membrane structures and functions • Membranes form fluid body compartments • Membranes as barriers and gatekeepers • How products move across membranes • Distribution of water and solutes in cells & the body • Chemical and electrical imbalances • Membrane permeability and changes visit us www.dentaltutor.in
- 4. Copyright © 2004 Pearson Education, Inc., publishing as Benjamin CummingsCopyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings • Membranous tissues: • Example: pericardial membrane • Epithelial tissues: one to many cells thick • Cell Membranes (plasmalemma) enclose cells Membranes: two meanings Figure 5-1: Membranes in the body visit us www.dentaltutor.in
- 5. Copyright © 2004 Pearson Education, Inc., publishing as Benjamin CummingsCopyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings • Cell structure & support • Barrier isolates cell (impermeable) • Chemically • Physically • Regulates exchange (semipermeable) • Cell communication Cell Membranes: Overview visit us www.dentaltutor.in
- 6. Copyright © 2004 Pearson Education, Inc., publishing as Benjamin CummingsCopyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings Cell Membranes: Overview Figure 5-2: The fluid mosaic model of the membranevisit us www.dentaltutor.in
- 7. Copyright © 2004 Pearson Education, Inc., publishing as Benjamin CummingsCopyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings • Phospholipid bilayer and cholesterol • Membrane proteins • Peripheral (associated) • Integral Membrane Structure visit us www.dentaltutor.in
- 8. Copyright © 2004 Pearson Education, Inc., publishing as Benjamin CummingsCopyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings • Structure • Cell polarity • Phosphorylation • Extracellular matrix Structural Membrane Proteins: Membrane-Spanning visit us www.dentaltutor.in
- 9. Copyright © 2004 Pearson Education, Inc., publishing as Benjamin CummingsCopyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings Structural Membrane Proteins: Membrane-Spanning Figure 5-4: The cytoskeleton is anchored to the cell membrane visit us www.dentaltutor.in
- 10. Copyright © 2004 Pearson Education, Inc., publishing as Benjamin CummingsCopyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings Structural Membrane Proteins: Membrane-Spanning Figure 5-5: Membrane-spanning proteins visit us www.dentaltutor.in
- 11. Copyright © 2004 Pearson Education, Inc., publishing as Benjamin CummingsCopyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings • Membrane associated enzymes • External reactions • Internal reactions • Receptors bind specific ligand • Example: Hormones • Cell recognition molecules Membrane Proteins that Bind Molecules Figure 5-6: Cell membrane receptor visit us www.dentaltutor.in
- 12. Copyright © 2004 Pearson Education, Inc., publishing as Benjamin CummingsCopyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings • Channel proteins • Open • Gated • Carrier proteins • Bind to substrate • Slower transport Transporter Proteins: Move Products Through Membrane visit us www.dentaltutor.in
- 13. Copyright © 2004 Pearson Education, Inc., publishing as Benjamin CummingsCopyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings Transporter Proteins: Move Products Through Membrane Figure 5-7: Transport proteins of the cell membrane visit us www.dentaltutor.in
- 14. Copyright © 2004 Pearson Education, Inc., publishing as Benjamin CummingsCopyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings Transporter Proteins: Move Products Through Membrane Figure 5-9: Gating of channel proteinsvisit us www.dentaltutor.in
- 15. Copyright © 2004 Pearson Education, Inc., publishing as Benjamin CummingsCopyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings • Glycolipids • Glycoproteins Membrane Carbohydrates: Form External Glycocaylx Figure 5-11: Map of cell membrane structurevisit us www.dentaltutor.in
- 16. Copyright © 2004 Pearson Education, Inc., publishing as Benjamin CummingsCopyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings Membrane Proteins and Functions Reviewed Figure 5-12: Map of membrane proteinsvisit us www.dentaltutor.in