Membrane Notes, Chapter 4 Cell Membrane Structure: A) Integral/transmembrane protein: Doorway for...
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Transcript of Membrane Notes, Chapter 4 Cell Membrane Structure: A) Integral/transmembrane protein: Doorway for...
![Page 1: Membrane Notes, Chapter 4 Cell Membrane Structure: A) Integral/transmembrane protein: Doorway for molecules to enter to cell B) Peripheral protein: Cytoskeleton.](https://reader030.fdocuments.in/reader030/viewer/2022032805/56649edf5503460f94befe00/html5/thumbnails/1.jpg)
Membrane Notes , Chapter 4
Cell Membrane Structure: A) Integral/transmembrane
protein: Doorway for molecules to enter to cell
B) Peripheral protein: Cytoskeleton anchor
C) Phospholipid bilayer: Cell boundary, regulates entry to cell.
![Page 2: Membrane Notes, Chapter 4 Cell Membrane Structure: A) Integral/transmembrane protein: Doorway for molecules to enter to cell B) Peripheral protein: Cytoskeleton.](https://reader030.fdocuments.in/reader030/viewer/2022032805/56649edf5503460f94befe00/html5/thumbnails/2.jpg)
Cell Membrane Structure Cont’d D) Phospholipid Head: Hydrophilic
Head E) Phospholipid Tail: Hydrophobic, can
be saturated, (membrane more solid because packed closer together) or unsaturated (membrane more fluid because don’t pack tightly together)
F) Cholesterol: Prevents membrane from solidifying
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Cell Membrane Structure Cont”d G) Sugars: Helps as an ID tag for
the cell H) Skip I) Skip J) Cytoskeleton fibers: Cell
Structure
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Cell membrane
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Fluid Mosaic Model Fluid: All the “stuff” moves around
with in the cell membrane. Mosaic: Membrane made up of
lots of different parts.
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Transport Across Membranes A) Passive Transport 1. Diffusion a) particles can move either way
across the membrane, depending on the concentration
b) size restrictions: large molecules will not pass (WNP), charged ions WNP, small stuff will pass!
![Page 7: Membrane Notes, Chapter 4 Cell Membrane Structure: A) Integral/transmembrane protein: Doorway for molecules to enter to cell B) Peripheral protein: Cytoskeleton.](https://reader030.fdocuments.in/reader030/viewer/2022032805/56649edf5503460f94befe00/html5/thumbnails/7.jpg)
Transport Across Membrane Cont’d 1) Diffusion 2) Osmosis: Diffusion of
water. 3) Facilitated Diffusion:
Some molecules require proteins to help them through the membrane (Down their concentration gradient* . Hi to LOW!)
*Concentration gradient: A difference between concentrations in a space.
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Diffusion Review
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Osmosis Review: Blue=SoluteRed=Water
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Transport Across Membrane Cont”d Types of facilitated Diffusion
Proteins: 1) carrier proteins* 2) Tunnel Proteins: Open tunnels
that allow passages
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Are these proteins exhibiting examples of passive transport?
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Transport across Membrane Cont’d B. Active Transport 1) Sodium Potassium Pump: In
order for neurons to work, we have to move sodium and potassium to a particular side of the membrane- not necessarily from an area of high to low concentration! Pumps used to move particles. ATP required to force particles through.
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Transporting Across Membrane: Active Transport cont’d 1. Sodium Potassium Pump 2. Bulk Transport a)Endocytosis (IN) Types: ^Pinocytosis: Cell “drinking” ^Phagocytosis: Cell “eating” ^Receptor mediated endocytosis Specific in terms of what food
particles will fuse with lysosomes to digest food
material.
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Transport Across Cell Membrane (bulk transport continued)
a) Endocytosis b) Exocytosis (OUT) Protein carriers:
^Sodium/Potassium Pump ^Coupled
Transport ^ Proton Pump
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Review of Endocytosis
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Review of Exocytosis
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