is maintaining stable internal conditions.

Cell Membrane = Semipermeable Membrane

they allow some things to cross but not others.

is movement of molecules from an area of higher concentration to an area of lower concentration.

is the diffusion of water across the cell membrane.

diffusion and osmosis and other methods of transport that do not require energy- molecules move from high to low concentration.

transport from areas of lower concentration to areas of higher concentration, requires energy.

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Section 3

Cell Communication

Question	Answer
Homeostasis	is maintaining stable internal conditions.
Cell Membrane = Semipermeable Membrane	they allow some things to cross but not others.
Diffusion	is movement of molecules from an area of higher concentration to an area of lower concentration.
Osmosis	is the diffusion of water across the cell membrane.
Passive Transport	diffusion and osmosis and other methods of transport that do not require energy- molecules move from high to low concentration.
Active Transport	transport from areas of lower concentration to areas of higher concentration, requires energy.