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What is the function of the membrane?
to regulate what enters and exits the cell
Why does the membrane have to regulate what enters and exits the cell?
to maintain homeostasis
What does cell transport refer to?
the movement into and out of the cell
the cell membrane is a?
phospholipid bilayer
The phospholipid bilayer of the cell membrane is...?
semipermeable
Semipermeable means...?
it allows some substances to pass through the membrane but not others
_____ is number of molecules of a substance in a given area
concentration
____ is the movement of molecules from a high concentration to a low concentration
diffusion
Molecules move ____ the concentration gradient
down
____ molecules cannot move straight through the membrane.
sometimes
Facilitated diffusion is the movement of molecules _____ concentration using a protein
from a higher concentration to a lower
____ is the diffusion of water across a semipermeable membrane.
osmosis
Water can move directly through the membrane or go through proteins called_____
aquaporins
Cells are not surrounded by and consist of ________water during osmosis.
only
There are substances _____ in the water during osmosis.
dissolved
solute is a...?
substance
