Movement Into And Out Of Cells Flashcards
What is diffusion?
The net movement of particles from a region of high concentration to a region of low concentration
What factor affect the rate of diffusion?
Steepness of the gradient
Temperature
Properties of molecules or ions (small of big, polar or non-polar)
Surface area
What is facilitated diffusion?
A method that cells use to transport large,polar molecules and ions into and out of the cell
Channel proteins and carrier proteins
What is active transport?
Transportation method that uses a transmembrane protein to move ions or molecules against the concentration gradient which requires ATP energy
Examples of active transport:
Nerve cells
Reabsorption in kidneys
Ions in soil
What is endocytosis?
A way molecules can enter a cell
Cell membrane engulfs material and forms a vesicle around it.
What is exocytosis?
A mechanism for molecules to leave the cell
Vesicles from Golgi apparatus fuse with cell membrane and release content outside cell.
What is osmosis?
The movement of water molecules from an area of high water potential to an area of low water potential through a partially permeable membrane
What is water potential?
It’s the tendency of water to move from one place to another
