Movement In and Out Of Cells Flashcards
Why is it good to have a large SA:V ratio?
Cells with a larger SA:V ratio are more efficient at diffusion and can transport materials into and out of the cell more efficiently
What is diffusion?
It is the net movement of a solute from a region of high concentration to a region of low concentration
What is the concentration gradient?
It is the difference in concentration of solutes in a solution between two regions
What is the concentration gradient?
The difference in concentration of solutes in a solution between two regions
What happens when a solution reaches equilibrium?
The particles are evenly distributed throughout a solution
What is osmosis?
The net movement of water from a region of high concentration to a region of low concentration across a selectively permeable membrane
What happens when a cell is hypotonic?
The cell expands
What happens when a cell is hypertonic
The cell shrinks
What is facilitated diffusion?
When channel proteins allow small selected materials to move across the selectively permeable membrane
Goes with the concentration gradient
What is active transport?
When carrier proteins move small materials across the membrane against the concentration gradient
What is endocytosis?
When large quantities of materials or large materials enter a cell
What is phagocytosis?
When solids enter a cell.
The membrane turns in and forms a vehicle around the solid
What is pinocytosis?
When fluids enter the cell
What is exocytosis?
When large molecules are transported out of the cell by fusing with the membrane before being released
