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| the science of the structure of living organisms |
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| the science of the functioning of living organisms |
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| the smallest part of an element; indivisible by ordinary chemical means |
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| the basic biological unit of living organisms, containing a nucleus and a variety of organelles enclosed by a limiting membrane |
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| particle consisting of two or more atoms held together by chemical bonds |
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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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| a part of the body formed of two or more tissues that performs a specialized function |
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| a group of organs that work together to perform a vital body function; e.g., nervous system |
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| an individual living thing |
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| a state of body equilibrium or stable internal environment of the body |
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| an organ, gland, or muscle capable of being activated by nerve endings |
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| a corrective mechanism that opposes or negates a variation from normal limits |
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| feedback that tends to cause a variable to change in the same direction as the initial change; enhances the stimulus |
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| below, in reference to a particular structure, with the body in the anatomical position |
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| farthest from the point of attachment of a limb or origin of a structure |
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| the sum total of the chemical reactions that occur in the body |
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| some type of sensor that monitors and responds to changes in the environment |
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| any of the building blocks of matter; oxygen, hydrogen, carbon, for example" |
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| substance composed of two or more different elements, the atoms of which are chemically united" |
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| an atom with a positive or negative electric charge" |
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| ionic compound that dissociates into charged particles (other than hydrogen or hydroxyl ions) when dissolved in water" |
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| a substance that accelerates a specific chemical reaction but that is not altered by the reaction" |
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| a compound that lack carbon; for example, water" |
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| a compound containing carbon; examples include proteins, carbohydrates, and fats" |
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| a homogenous mixture of two or more components" |
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| subatomic particle that bears a positive charge; located in the atomic nucleus" |
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| nonsymmetrical molecules that contain electrically unbalanced atoms" |
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| the symbol for hydrogen ion concentration; a measure of the relative acidity or alkalinity of a solution" |
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| a fundamental particle that does not carry a positive or a negative charge" |
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| (1) a chemical reaction that occurs between an acid and a base; (2) blockage of the harmful effects of bacterial exotoxins or viruses by the binding of antibodies to their functional sites" |
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| dissociation; the breakdown of a molecule in solution to form ions" |
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| anything that occupies space and has mass" |
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| a substance formed by living cells that acts as a catalyst in bodily chemical reactions" |
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Definition
| weak bond in which a hydrogen atom forms a bridge between two electron-hungry atoms; an important intramo-lecular bond" |
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Definition
| a substance that accepts hydrogen ions; proton acceptor; compare with acid" |
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Definition
| a substance that liberates hydrogen ions when in an aqueous solution; compare with base" |
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Definition
| a substance that breaks down into ions when in solution and is capable of conducting an electric current" |
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Definition
| these vary in the number of neutrons they contain and they are different atomic form of the same element" |
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