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Tue, 21 Apr 2009 15:08:03 +0100

* Cell Structures

* Cell Structure Lesson 1

* Cell Structure Lesson 2

* Cell Structure Animated

Plasmlemma

Tue, 21 Apr 2009 15:06:01 +0100

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Homeostasis

Tue, 21 Apr 2009 15:03:17 +0100

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Plasma Membrane: Gateway To The Cell

Tue, 21 Apr 2009 15:14:00 +0100

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Cell Membrane: Active Transport:

Tue, 21 Apr 2009 14:59:35 +0100

Active transport is the mediated process of moving particles across a biological membrane against a concentration gradient . If the process uses chemical energy, such as from adenosine triphosphate (ATP), it is termed primary active transport Secondary active transport involves the use of an electrochemical gradient . Also active transport uses energy unlike passive transport which does not use any energy

Cell Membrane

Tue, 21 Apr 2009 14:57:44 +0100

The cell membrane is a double layer of phospholipid molecules.Protiens in the cell membrane provide structural support, form channels for passage of materials, act as receptor sites, function as carrier molecules, and provide identification markers.

Cell Membrane - video powered by Metacafe

What Is Physiology?

Tue, 21 Apr 2009 14:48:07 +0100

The name organelle comes from the idea that these structures are to cells what

an organ is to thebody (hence the name organelle, the suffix -elle being

a diminutive). Organelles are identified bymicroscopy, and can also be purified

by cell fractionation. There are many types of organelles, particularly in

the eukaryotic cells of higher organisms. Prokaryotes were once thought

not to have organelles, but some examples have now been identified.