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Definitions - Ch. 2
Anatomy & Physiology Chapter 2 Definintions
| Question | Answer |
|---|---|
| matter | anything that occupies space and has mass |
| states of matter | solid, liquid, gas |
| solid | has definite shape and volume |
| liquid | has definite shape but no definite volume (has no definite shape and definite volume) |
| gas | does not have definite shape or volume |
| energy | the capacity to do work or put matter into motion |
| kinetic energy | energy in action |
| potential energy | stored energy; has the capability to do work but is not now doing so |
| forms of energy | chemical, electrical, mechanical, radiant |
| chemical energy | stored in the bonds of chemical substances (food molecules, ATP). biological usable form of energy |
| electrical energy | movement of charged particles |
| mechanical | energy directly involved in moving matter |
| radiant | energy that travels in waves (electromagnetic spectrum) |
| enzyme | biological catalyst (a substance that speeds up the rate of chemical reaction without undergoing any chemical change itself) |
| molecule | combination of two or more atoms held together by chemical bonds |
| atom | composted of protons neutrons and electrons |
| nucleus | composed of protons and neutrons |
| element | composed of atoms that display the characteristic properties of that element |
| compound | when two or more different kinds of atoms bind to form molecules |
| mixtures | substances composed of tow or more substances physically intermixed (can be separated) |
| solutions | homogeneous mixtures of components that may be gases, liquids, or solids |
| solvent | substances in a solution present in the greatest amount (dissolving medium) |
| solute | substance in a solution present in smaller amounts (thing that is dissolved) |
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