Diffusion - Physiology - Revision history

Bara at 14:41, 5 July 2012

2012-07-05T14:41:35Z

2010-12-10T13:29:50Z

Text replace - "[[Introduction to the Phospholipid Bilayer - Anatomy & Physiology" to "[[Phospholipid Bilayer - Anatomy & Physiology"

2010-12-10T13:26:29Z

Ficks Law

2010-12-10T13:26:11Z

2010-08-22T12:20:40Z

2008-10-08T07:51:41Z

2008-09-10T09:50:50Z

Diffusion Through the Lipid Bilayer

2008-09-07T12:42:45Z

Diffusion Through the Lipid Bilayer

2008-09-07T12:41:44Z

Introduction

2008-09-02T11:34:56Z

More Information

@@ Line 1: / Line 1: @@
 ==Introduction==
@@ Line 32: / Line 33: @@
 * This occurs passively down the concentration gradient.
 [[Category:Transport Across Membranes]]

@@ Line 29: / Line 29: @@
 ==Diffusion Through the Lipid Bilayer==
-* Lipid soluble substances are able to diffuse freely across the [[Introduction to the Phospholipid Bilayer - Anatomy & Physiology|lipid bilayer of cells.]]
+* Lipid soluble substances are able to diffuse freely across the [[Phospholipid Bilayer - Anatomy & Physiology|lipid bilayer of cells.]]
 * This occurs passively down the concentration gradient.
 [[Category:Transport Across Membranes]]

@@ Line 10: / Line 10: @@
 <big>'''Q = DA((C<sub>1</sub> - C<sub>2</sub>) &#247; L)'''</big>
 '''Q''' = the transport rate of a substance by diffusion
 '''D''' = The diffusion coefficient
 '''A''' = The cross sectional area which the substance is to diffuse across
 '''C<sub>1</sub> C<sub>2</sub>''' = The concentrations in the two areas
 '''L''' = distance separating the two areas

@@ Line 1: / Line 1: @@
 ==Introduction==
@@ Line 18: / Line 8: @@
 ==Ficks Law==
 [[Image:simpdifdiag.jpg|right|thumb|250px|<small><center>A Simple Schematic Diagram of Diffusion Across a Cell Membrane(Courtesy of Mariana Ruiz Villarreal)</center></small>]]
-  <big>'''Q = DA((C<sub>1</sub> - C<sub>2</sub>) &#247; L)'''</big>
+<big>'''Q = DA((C<sub>1</sub> - C<sub>2</sub>) &#247; L)'''</big>
-−
-  '''Q''' = the transport rate of a substance by diffusion
+'''Q''' = the transport rate of a substance by diffusion
-  '''D''' = The diffusion coefficient
+'''D''' = The diffusion coefficient
-  '''A''' = The cross sectional area which the substance is to diffuse across
+'''A''' = The cross sectional area which the substance is to diffuse across
-  '''C<sub>1</sub> C<sub>2</sub>''' = The concentrations in the two areas
+'''C<sub>1</sub> C<sub>2</sub>''' = The concentrations in the two areas
-  '''L''' = distance separating the two areas
+'''L''' = distance separating the two areas
 Ficks law demonstrates that the rate of diffusion can be maximised by increasing the area over which diffusion can occur, minimising the distance it has to occur over and increasing the gradient it occurs along.  In the body it tends to be the former two which are taken into account when adapting surfaces for diffusion to occur over.
@@ Line 37: / Line 27: @@
 * This occurs passively down the concentration gradient.
-[[Category:Urinary System]]
+[[Category:Transport Across Membranes]]

@@ Line 6: / Line 6: @@
 |sublink1=Transport Across Membranes - Physiology
 |subtext1=TRANSPORT ACROSS MEMBRANES
 }}
 <br>
@@ Line 37: / Line 36: @@
 * Lipid soluble substances are able to diffuse freely across the [[Introduction to the Phospholipid Bilayer - Anatomy & Physiology|lipid bilayer of cells.]]
 * This occurs passively down the concentration gradient.

@@ Line 1: / Line 1: @@
 {{toplink
-|backcolour = C1F0F6
+|linkpage =Urinary System - Anatomy & Physiology
-|linkpage =Transport Across Membranes - Physiology
+|linktext =URINARY SYSTEM
 |maplink = Urinary System (Content Map) - Anatomy & Physiology
 |pagetype =Anatomy
 }}

← Older revision		Revision as of 12:42, 7 September 2008
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	* Lipid soluble substances are able to diffuse freely across the lipid bilayer of cells.		* Lipid soluble substances are able to diffuse freely across the lipid bilayer of cells.
−	* This ~~obviously~~ occurs passively down the concentration gradient.	+	* This occurs passively down the concentration gradient.

← Older revision		Revision as of 12:41, 7 September 2008
Line 10:		Line 10:
	==Introduction==		==Introduction==

−	~~If gases~~ or liquids ~~are~~ unevenly distributed between two areas. ~~One~~ area ~~having~~ a higher concentration than the other then the differance between ~~those~~ two areas is termed the '''concentration gradient'''. The equality is then corrected by the movement of the molecules down this so called gradient from the region of high concentration to that of low. This process is '''passive''' as the molecules do not have to be forced to do this and it is reffered to as '''diffusion'''.	+	Gases or liquids can be unevenly distributed between two areas. If one area has a higher concentration than the other then the differance between these two areas is termed the '''concentration gradient'''. The equality is then corrected by the movement of the molecules down this so called gradient from the region of high concentration to that of low. This process is '''passive''' as the molecules do not have to be forced to do this and it is reffered to as '''diffusion'''.

← Older revision		Revision as of 11:34, 2 September 2008
Line 35:		Line 35:
	* Lipid soluble substances are able to diffuse freely across the lipid bilayer of cells.		* Lipid soluble substances are able to diffuse freely across the lipid bilayer of cells.
	* This obviously occurs passively down the concentration gradient.		* This obviously occurs passively down the concentration gradient.
−
−	~~==More Information==~~
−
−	~~If more information is need it can be found [http://en.wikipedia.org/wiki/Passive_diffusion here]~~