the movement of any molecule from high to low concentration and requires no energy.
special type of diffusion which is the movement of water from an are of high to low concentration
part of the cell that regulates what can and cannot enter the cell
The core of nearly all cell membranes is a double-layered sheet called a
When an environment is equal on both side of them membrane
the core of nearly all cell membranes is a double-layered sheet.
is the mass of solute in a given volume of solution, or mass/volume.
property of biological membranes that allows only certain substances to pass through ( it is like a shark tank or a screen door)
movement of specific molecules across cell membranes through protein channels.
energy-requiring process that moves material across a cell membrane against a concentration difference.
process by which a cell takes material into the cell by infolding of the cell membrane.
process in which extensions of cytoplasm surround and engulf large particles and take them into the cell ( "cell eating" )
process by which a cell releases large amounts of material.