INTRODUCTION OF PLASMA MEMBRANE MODEL OF PLASMA MEMBRANE TRANSPORT OF SMALL MOLECULE PASSIVE TRANSPORT TYPE ( DIFFUSION, FACILITATED) MECHANISM REFRENCES

1. TRANSPORT OF SMALL MOLECULE ACROSS CELL
MEMBRANE: PASSIVE MECHANISM
By
KAUSHAL KUMAR SAHU
Assistant Professor (Ad Hoc)
Department of Biotechnology
Govt. Digvijay Autonomous P. G. College
Raj-Nandgaon ( C. G. )

2. CONTENT
 INTRODUCTION OF PLASMA MEMBRANE
 MODEL OF PLASMA MEMBRANE
 TRANSPORT OF SMALL MOLECULE
 PASSIVE TRANSPORT
 TYPE ( DIFFUSION, FACILITATED)
 MECHANISM
 REFRENCES

3. PLASMA MEMBRANE
Cytoplasm enclosed by a layer is called as plasma
membrane.
 This term was first coined by C.NAGELI & C.CRAMER
(1855).
 IN 1925, Two Dutch Scientist EDWIN GORTER &
F.GRENDEL extracted membrane lipid from red blood cell
corresponding to the surface of plasma membrane..
 Plasma membrane is selectively permeable membrane.
 Membrane maintain the equilibrium between the two
compartment & act as a barrier.
 Membrane made up of phospholipids bi-layer, protein,
carbohydrate.

4. FLUID MOSIC MODEL

5. Transport Of Small Molecule

6. PASSIVE TRANSPORT
 Net movement of substance across the
membrane without requirement of ATP.
 The activity of a cell depend on the
material that enter or leave the cell.
 To stay alive a cell must exchange
material such as food, oxygen, water with
it surrounding.

7. TYPE OF PASSIVE TRANSPORT
Simple
diffusion
Facilitated
diffusion

8. SIMPLE DIFFUSION

9. OSMOSIS

10. TONICITY

11. PLASMOLYSIS

12. FACTOE AFFECT DIFFUSION RATE
 Concentration
 Temperature
 Molecular size
 Viscosity

13. SIGNIFICATION OF OSMOSIS
 Plant absorbed water from the soil by root
& root hair through osmosis.
 Water move amongst the cell on the
principle of osmosis.
 Osmosis control the opening & closing of
stomata.
 Osmosis maintain the turgidity of leaves.

14. FACILITATED DIFFUSION
 The small molecule use carrier protein to
cross the membrane is called Facilitated
Diffusion.
 Transport can be carried out by:
Carrier protein & Ion channel.
NO need of requirement of ATP.

15. TRANSPORT OF GLUCOSE
 Glucose bind with
protein.
 Conformation change
takes place.
 Glucose releases
inside the cell.
 Return to their
original conformation.

16. ION CHANNEL
 Transport through channel is extremely rapid,
more than a million ions per second flow
through open channel.
 Ion channel are highly selective because narrow
pore in the channel restrict the passage of ion.
 Most ion channel are not permanent open ,its
opening & closing is regulated gate.
 Gate can be:
 Voltage-gate channel.
 Ligand –gate channel.

17. REFERENCES
 Geoffrey M. Cooper , Robert E. Hausman (2007) The Cell
Molecular Approach. 4rth Edition
Published By :Sinauer Association, Inc.
 Gupta And Jangir (1998) The Cell Biology Fundamental
Application
Published By : Agro Botanica.
 E.E.P De Robert, E.M.F De Robert (1995) Cell And
Molecular Biology 8th Edition
Published By: B.I. Waverly Pvt. Ltd.
Wikipedia .com /passive transport .html