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General overview of Plasma/ Cell membrane.
Definition of Plasma/ Cell membrane
Structure of Plasma membrane
1. Sandwitch model OR Danielli- Davson Model
2. Fluid mosaic model
Plasma Membrane Proteins
Chemical Composition of Plasma/ Cell Membrane
Movement across the Cell Membrane
Channels through cell membrane
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
General overview of Plasma/ Cell membrane.
Definition of Plasma/ Cell membrane
Structure of Plasma membrane
1. Sandwitch model OR Danielli- Davson Model
2. Fluid mosaic model
Plasma Membrane Proteins
Chemical Composition of Plasma/ Cell Membrane
Movement across the Cell Membrane
Channels through cell membrane
"Plasma membrane structure and function"
Presented by :
Jitul Kalita
Department of biotechnology,
Pandu College, Guwahati, Assam
jitulkalitaown@gmail.com
The cell membrane, or plasma membrane, is a biological membrane that separates the interior of all cells from the outside environment.
The cell membrane is selectively permeable to ions and organic molecules and controls the movement of substances in and out of cells.
"Plasma membrane structure and function"
Presented by :
Jitul Kalita
Department of biotechnology,
Pandu College, Guwahati, Assam
jitulkalitaown@gmail.com
The cell membrane, or plasma membrane, is a biological membrane that separates the interior of all cells from the outside environment.
The cell membrane is selectively permeable to ions and organic molecules and controls the movement of substances in and out of cells.
Structure and function of plasma membrane 2ICHHA PURAK
The presentation consists of 72 slides,describes following heads
DEFINITION : STRUCTURE OF PLASMA MEMBRANE
COMPONENTS OF PLASMA MEMBRANE ( (BIOCHEMICAL PROPERTIES)
LIPID BILAYER
PROTEINS
CARBOHYDRATES
CHOLESTEROL
MODELS EXPLAINING STRUCTURE OF BIO MEMBRANE
FLUID MOSAIC MODEL
MOBILITY OF MEMBRANE
GLYCOCALYX : GLYCOPROTEINS AND GLYCOLIPIDS
TRANSPORT OF IONS AND MOLECULES ACROSS PLASMA MEMBRANE
FUNCTIONS OF PLASMA MEMBRANE
DIVERSITY OF CELL MEMBRANES
SITE OF ATPASE ION CARRIER CHANNELS AND PUMPS-RECEPTORS
The chapter contain detail descriptions regarding structures and functions of different cell organelles of plant and animal cells which is helpful to UG and PG students of Science. Cell is the basic unit of structure and function in all living organisms. The basic constituents of plant and animal cells are the same,
viz nucleic acid, proteins, carbohydrates, lipids and various inorganic substances
They organized in the same fundamental manner. The shape of plant cell is rectangular and that of animal cell is round with irregular appearance. Cell organelles various membrane bound structures that are
found within a cell such as nucleus, plastids, mitochondria,
endoplasmic reticulum etc.
INTRODUCTION
plasma membrane is also known as cell membrane or cytoplasm membrane.
It is the biological membrane, separates interior of the cell from the outside environment.
Selective permeable to Ions and organic molecules.
Its basic function is to protect the cell from its surroundings.
It consists of the phospholipids bilayer with embedded proteins.
Cell membranes are involved in: cell adhesion, ion conductivity and cell signaling and serve as the attachment surface for several extracellular structures.
Biological screening of herbal drugs: Introduction and Need for
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2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
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Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
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2. Plasma membrane
Membranes are highly viscous, plastic structures. Plasma membranes form
closed compartments around cellular protoplasm to separate one cell from
another and thus permit cellular individuality.
It separates and protects the cell from the external hostile environment.
Besides being a protective barrier, plasma membrane provides a
connecting system between the cell and its environment.
The subcellular organelles such as nucleus, mitochondria, lysosomes are
also surrounded by membranes.
3. It forms closed compartment around cellular protoplasm to define cell
boundaries.
It has selective permeability for various substances and ions provided by
transporters & ion channel.
It also exchanges material with the ECF by exocytosis & endocytosis and
with adjacent cell through gap junction.
It also plays a key role in cell-cell interactions & in trans-membrane
signalling.
It provides site of energy transduction; such as in photosynthesis &
oxidative phosphorylation.
It localizes enzymes & acts as integral element in excitation-contraction
coupling.
Functions of the plasma membrane:
4. Chemical composition
Lipids and proteins together constitute the major components of membranes.
Some of the proteins and lipids, however, may have oligosaccharides,
covalently attached to them. The sugar containing sequences of these
glycoproteins and glycolipids also play a role in determining the identity of
cells.
(a) Membrane Lipids:
The major lipids in the cell membrane are phospholipids, cholesterol and
glycolipid, Cholesterol is abundant in the plasma membrane of mammals. Plant
membranes have little or cholesterol. Phytosterols are present in plant
membranes. It is absent in cell membranes of mo of the prokaryotes. However,
all the membranes have phospholipids.
5. membrane-spanning sections. A typical membrane-spanning segment consists
of 20-25 hydrophobic amino acids arranged in an alpha helix, although not all
transmembrane proteins fit this model. Some integral membrane proteins form
a channel that allows ions or other small molecules to pass, as shown below.
Peripheral membrane proteins are found on the outside and inside
surfaces of membranes, attached either to integral proteins or to
phospholipids. Unlike integral membrane proteins, peripheral
membrane proteins do not stick into the hydrophobic core of the
membrane, and they tend to be more loosely attached.
6. (c) Carbohydrates/ the glycocalyx
The surface of the cell is covered by a carbohydrate coat known as the glycocalyx,
which is formed by the oligosaccharides of glycolipids and transmembrane
glycoproteins.
7. 1)Part of the role of the glycocalyx is to protect the cell surface.
2)In addition, oligosaccharides of the glycocalyx serve as markers for a variety of
cell-cell interactions.
3)The oligosaccharides exposed on the cell surface provide a set of markers that
help identify the distinct cell types of multicellular organisms. these proteins are
usually glycosylated, as are the peripheral membrane proteins bound to the
external face of plasma membrane.
Functions of glycocalyx:
