Membrane Structure and Function - Phoenix College
[Pages:6]Membrane Structure and Function
Eukaryotic Cell: Neuron
Membrane Structure and Function
All cells have a plasma or cell membrane, which contains the cell. Scanning electron micrograph (SEM) of adipocytes (Ad)
Membrane Structure and Function
Prokaryotic Cells: Bacteria
The Formation of Cell Membranes is Crucial to Life
Functions of the Cell Membrane
? Contains the cell ? Regulates the traffic
of molecules and substances in and out of the cell (semipermeable membrane)
Cell Membrane Structure
Pancreatic Secretory Cell: TEM of Basal and Apical Parts
Major Components of the Cell
Membrane
? The major constituents of the cell membrane are proteins and lipids
? Membrane proteins and lipids are arranged in a particular fashion, both contributing to containing the cell and to selectively allowing or blocking the traffic of certain substances through the cell
? Such arrangement of molecules provides fluidity to the cell membrane
Major Components of the Cell Membrane: Lipids
? Phospholipids are amphipathic molecules (with hydrophobic tails and a hydrophilic head)
? One of the phospholipid tails exist mostly in a trans configuration, providing more fluidity to the membrane
? Cholesterol is a rigid molecule that makes membranes less fluid
Cholesterol
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