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Membrane Structure & Function - Coggle Diagram
Membrane Structure & Function
Fluid Mosiac Model
The fluid mosaic model of membrane structure depicts the membrane as a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids
Phospholipids Bilayer
Amiphipathic
Hydrophobic "water - fearing" tail
Hydrophilic "water-loving" head
Creates a semi-permable barrier
Protein
Intergral protein
span the membrane
Peripheral protein
on the surface
Cholesterol
Keeps membrane fluid
At warm temperatures (such as 37 °C)
cholesterol restrains movement of phospholipid
Less fluid
If hot, cholesterol keeps the cells solid
If iced cold, Cholesterol will help cells not develop ice
At cool Temperatures
it maintains fluidity by preventing tight packing
more fluid
• Cholesterol is a membrane component in animal cells that has variable effects on membrane fluidity at different temperatures
Acts as a fluid buffer
Carbohydrates
surface markers
if markers are not working, it can lead to autoimmune disease
Glycoproteins & glycolipid
Important for cell recognition
What 3 characteristics of substances let them move easily move from one side to the other
small
Nonpolar
uncharged
3 characteristics that make it difficuly or impossible
Polar
IONS (charged)
Large
Moves by means of passive transport (needs no ATP)
Selective premability
Membrane =
selectively permable
Allows some substances to cross more easily
Active Transport
movement requires energy (ATP)
Movement of molecules from low concestration to high concentration
Passive Transport
Movement without energy (ATP)
From high concentration to low concentration
Types
Simple diffusion
directly through lipid bilayer
Facilitated diffusion
uses channel or carrier proteins
Osmosis
diffusion of water
Water moves from high water → low water
Or low solute → high solute
GOAL
reach equilibrium
