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CGHS Biology - Cell Membrane and Transport

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Sean Holder

on 11 November 2014

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Transcript of CGHS Biology - Cell Membrane and Transport

Let's put the thinking
caps on...
How is a window screen
similar to a cell membrane?
Composition of a cell membrane
How Do Molecules Pass
Through the Membrane?
Two Ways: Passive Transport
and Active Transport
Active Transport
Requires ATP (cellular energy)
Movement of molecules AGAINST the concentration gradient
Movement of molecules from
Low concentration High concentration
Cell Membranes and Transport
Factors that affect transport
Smaller molecules move faster through than larger through a membrane
Types of Active Transport
Endocytosis (Phagocytosis): large
particles are ingested into the cell
What are some things that can
pass through a window screen?
What are some things that can
not pass through a window
screen? Why is it important to
keep these things from moving
through the screen?
Selectively permeable: allows only certain things to enter
Lipid Bilayer: Double layered structure composed of lipids, proteins, and carbohydrates
Hydrophilic: Phosphate heads face the cytoplasm “ water loving”
Hydrophobic: Fatty acid tails stay away from cytoplasm “water fearing”
Protein Channel: passageway for large molecules to enter and leave cell
Carbohydrate Chains: can receive certain molecules into cell
Passive Transport: Energy is NOT required. Molecules pass through the selectively permeable membrane until they are equal on both sides of the membrane
Does NOT require energy
Occurs when there is a concentration GRADIENT
Gradient: a difference in amounts. Gradients move from high to low
Facilitate= help
No energy is required
helped by a protein channel
Proteins channels have larger openings so that larger molecules diffuse through the membrane
Moves with the gradient HIGH LOW CONCENTRATION
Facilitated Diffusion
Exocytosis: molecules moving
OUT of the cell
The outside of membrane is attracted to polar molecules
Concentration of molecules on one side of a membrane can affect rate which movement happens
Temperature: molecules move quicker in warmer temps and slower in cooler temp
Full transcript