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Cell membrane the semipermeable membrane surrounding the cytoplasm of a cell.
cell wall a rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria. In the algae and higher plants, it consists mainly of cellulose.
lipid bilayer The lipid bilayer (or phospholipid bilayer) is a thin polar membrane made of two layers of lipid molecules. These membranes are flat sheets that form a continuous barrier around all cells.
concentration The measure of the amount of a sub-component (especially solute) in a solution.
diffusion Diffusion is the net passive movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration. It continues until the concentration of substances is uniform throughout.
equilibrium The condition in which all acting influences are balanced or canceled by equal opposing forces, resulting in a stable system
cell specialzation Cell specialization is the differentiation of cells as they develop, depending on their location in a tissue or organ
organ a group of tissues in a living organism that have been adapted to perform a specific function.
osmosis water passing through a cell membrane
hypertonic where the concentration of solutes is greater outside the cell than inside it
facilated diffusion the process of spontaneous passive transport (as opposed to active transport) of molecules or ions
active transport the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.
Phagocytosis the process by which a cell—often a phagocyte or a protist—engulfs a solid particle to form an internal compartment known as a phagosome.
pinocytosis absorbing liquid
endocytosis the taking in of matter by a living cell by invagination of its membrane to form a vacuole.
exocytosis a process by which the contents of a cell vacuole are released to the exterior through fusion of the vacuole membrane with the cell membrane.
tissue tissue is a cellular organizational level between cells and a complete organ
organ system In biology, an organ system is a group of organs that work together to perform one or more functions. Each does a particular job in the body, and is made up of certain tissues.
hypotonic any solution that has a lower osmotic pressure than another solution. In the biological fields, this generally refers to a solution that has less solute and more water than another solution.
isotonic solution This state allows for the free movement of water across the membrane without changing the concentration of solutes on either side

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