main function of the cell membrane is to maintain...
phospholipid bilayer and proteins
cell membrane is made of...
particles that are in constant motion require
during diffusion, particles move from an area of higher concentration to an area of:
osmosis is the diffusion of water across a:
when plants absorb water they build up:
concentration of water is greater outside the cell than inside the cell
the movement of a substance across a membrane without the aid of energy
active transport requires ______________ to move substances across a membrane
out of the cell
sodium potassium pump pumps Na+
into the cell
sodium potassium pump pumps K+