Cell Trasport Membrane Flashcards
Selective permeability
The plasma membrane maintains the proper concentration of materials inside the cell by controlling the passage of materials into and out of the cell
Homeostasis
The regulation of an organism’s internal environment to maintain conditions
Structure of the plasma lipids
The plasma membrane is composed of a lipid belayer-2 layers of lipids embedded in lipid belayer
Lipids
Include fats and oils
fluid mosaic model
What determines what can cross the membrane?
Some proteins
Passive transport
Form high concentration to low concentration
Pushing a ball down a hill
Active transport
From low concentration to high concentration-requires energy (ATP)
*pushing a ball up a hill
Discussion
The net movement of particles that are dissolved in water from an area of higher concentration to an area of lower concentration
Facilitated diffusion
Occurs in cells when substances are moved from an area of higher concentration to an area of lower concentration.
Osmosis
The diffusion of water molecules