2.4 Transport across membrane Flashcards
Permeability method & Ion
Small uncharged molecule
Permeable
Oxygen
Carbon Dioxide
Permeability method & Ion
Lipid-soluble, non-polar molecule
Permeable
Alcohol
Chloroform
Steroids
Permeability method & Ion
Small polar molecule
Permeable or semi-permeable
Water
Urea
Permeability method & Ion
Small ion
Non-permeable
Moves through protein channel
Potassium Ion
Sodium Ion
Chloride Ion
Permeability method & Ion
Large, polar water-soluble molecule
Non-permeable
Moves through protein channel
Amino acids
Glucose
List
Methods to move across the membrane
5 Methods
Simple Diffusion
Facilitated Diffusion
Osmosis
Active Transport
Exocytosis and Endocytosis
Explain
Simple Diffusion
Passive movement of particles down the concentrateion gradient
Semi-permeable membrane only allows certan substances across
Does not require energy
Explain
Facilitated Diffusion
The passive movment of specific molecules from high concentration via a specific transport protein
More rapid than diffusion
Usually large polar molecules (that connot more directly through the membrane).
Explain
Osmosis
The passive movment of water molecules across a semi-permeable membrane from high to low concentration
Explain
Isotonic
Isotonic
The concentration of solutes in the solution is equal to that inside the cell
No net flow of water
Explain
Hypotonic
Hypotonic
The solution has a lower concentration of solutes than inside the cell
Explain
Hypertonic
Hypertonic
The solution has a higher concentration of solutes than inside the cell
A Hypotonic envionment causes what?
Causes plasmolysis in plants
Causes crenation in animals
A Hypertonic envionment causes what?
Causes turgor in plants
Causes haemolysis in animals
