Passive transport: Diffusion and Osmosis Flashcards
Types of passive transport:
Diffusion and osmosis
What is passive transport?
The movement of materials across the cell membrane without the use of energy.
Define diffusion.
The movement of any molecule from a region of high concentration to low.
Simple diffusion.
The diffusion of substances directly through the phospholipid bilayer.
________ is the diffusion of substances through the cell membrane via protein channels.
Facilitated diffusion
What term do we use to describe the movement of substances across a cell membrane without the expenditure of energy?
Passive transport
When do materials stop moving by passive transport?
When the materials have reached equilibrium.
What is osmosis?
The movement of water from an area of high concentration to low concentration.
When solutions have equal solute concentrations they are ______.
Isotonic
What is a hypotonic solution?
A solution with a lower solute concentration (higher water concentration)
A solution with a higher solute concentration and lower water concentration is _________.
Hypertonic
Seawater is an example of which type of solution compared to freshwater?
hypertonic
The steeper the concentration gradient, the…
The faster a material will move to an area of lower concentration.
Why does SA:V influence the rate of exchange in cells?
it won’t be able to efficiently get the nutrients it needs.
