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| the spreading of particles in a gas or solution with a movement toward uniform distribution of particles |
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| the diffusion of a solvent through a membrane from a dilute solution into a more concentrated one |
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| the passive movement of a substance across a cell membrane by means of a protein carrier |
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| an organ specialized to secrete or excrete substances for further use in the body for elimination |
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| net movement of a substance across a membrane against a concentration or electrical gradient requires release and use of cellular energy |
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| dense structure composed of tightly coiled DNA strands and associated histones that become visible in the nucleus when a cell prepares to undergo mitosis or meiosis normal human somatic cells contain 46 chromosomes a piece |
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| regional differences in the concentration of a particular substance |
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| a substance that breaks down into ions when in solution and is capable of conducting an electric current |
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| a nucleic acid consisting of a chain of nucleotides that contain the sugar deoxyribose and the nitrogenous bases adenine guanine cytosine and thymine |
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| the substance of a cell other than that of the nucleus |
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| excessive above normal tone or tension |
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| below normal tone or tension |
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| having a uniform tension of the same tone |
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| any sheet or partition a layer consisting of an epithelium and the underlying connective tissue |
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| the division of the cell nucleus often followed by division of the cytoplasm of a cell |
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| specialized structures in a cell that perform specific metabolic functions |
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| a group of similar cells specialized to perform a specific function primary tissue types are epithelial connective muscle and nervous tissues |
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| the skin and its accessory organs |
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| the deep layer of the skin composed of dense irregular connective tissue |
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