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14 Cards in this Set

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lipid bilayer
double layered sheet that forms the core of nearly all cell membranes
Concentration
the mass of solute in a given volume of solution, mass, or volume
Diffusion
Process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated.
Selective Permeability
Property of biological membranes that allows only certain substances to pass through them.
Osmosis
Diffusion of water through a selectively permeable membrane.
Facilitated Diffusion
Movement of specific molecules across cell membranes through protein channels.
Active transport
Energy requiring process that movies material across a cell membrane against a concentration difference.
Endocytosis
Process by which a cell takes material into the cell by infolding of the cell membrane.
Phagocytosis
process in which extensionsof cytoplasm surround and engulf large particles and take them into the cell.
Exocytosis
Process by which a cell releasees large amounts of material
Cell specialization
seperate roles for each type of cell in multicellular organisms.
Tissue
Group of similar cells that perform a particular function
Organ
Group of tissues that work together to perform closely related functions
Organ system
Group of organs that work together to perform a specific function.