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biology chapter7 #2

cells part 2

QuestionAnswer
cell membrane thin, flexible barrier around a cell; regulars what enters and leaves the cell
cell wall strong supporting layer around the cell membrane in plants, algae, and some bacteria
lipid bilayer doube-layered sheet that forms the core of nearly all cell membranes
concentration the mass of solute in a given volume of solution, or mass/volume
diffusion prices by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated
equilibrium when the concentration of a solute is the same throughout a solutions
osmosis diffusion of water through a selectively permeable membrane
isotonic when the concentration of two solutions is the same
hypertonic when comparing two solutions, the solution with the greater concentration of solutes
hypotonic when comparing two solutions, the solution with the lesser concentration of solutes
facilitated diffusion movement of specific molecules across cell membranes through protein channels
active transport energy-requiring process that moves material across a cell membrane against a concentration difference
endocytosis the process of taking material into the cell by means of infoldings, or pockets, of the cell membrane
phagocytosis when extensions of cytoplasm surround a particle and package it within a food vacuole
pinocytosis process by which a cell takes in liquid from the surrounding environment
exocytosis the membrane of the vacuole surrounding the material fuses with the cell membrane, forcing the contents out of the cell
cell specialization when cells throughout an organism can develop in different ways to perform different tasks
tissue is a group of similar cells that perform a particular function
organ a group of many tissues that work together to perform a specific function
organ system a group of organs that work together to perform a specific function
Created by: tatumw
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