21 Sept 2026 Science
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27 Terms
homeostasis
the process of keeping conditions inside an organism or cell stable and balanced
cell membrane
a thin flexible layer around a cell that controls what enters and leaves the cell
diffusion
the movement of molecules from an area of higher concentration to an area of lower concentration
exocytosis
the process a cell uses to move materials out of the cell
selectively permeable
a property of the cell membrane that allows some substances to pass through while blocking others
osmosis
the movement of water across a cell membrane from an area with more water to an area with less water
endocytosis
the process a cell uses to bring materials into the cell
facilitated diffusion
the process by which molecules move from an area of higher concentration to an area of lower concentration through transport proteins in the cell membrane
active transport
the movement of materials across a cell membrane using cellular energy
passive transport
the movement of materials across a cell membrane without using cellular energy
concentration gradient
a difference in the concentration of a specific molecule across a cell membrane
equilibrium
a state in which there is a balance between the movement of molecules into and out of the cell