The cell membrane, also known as the plasma membrane, is a double layer of lipids and proteins that surrounds a cell and separates the cytoplasm (the contents of the cell) from its surrounding environ
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Learn about how phospholipids form the cell membrane, and what types of molecules can passively diffuse through the membrane. By William Tsai. Created by Wil...
All living cells and many of the tiny organelles internal to cells are bounded by thin membranes. These membranes are composed primarily of phospholipids and proteins and are typically described as p
Biology4Kids.com! This tutorial introduces cell membranes. Other sections include plants, animal systems, invertebrates, vertebrates, and microorganisms.
Hank describes how cells regulate their contents and communicate with one another via mechanisms within the cell membrane. Crash Course Biology is now availa...