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Some Basic Chemistry

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Term
Description
elements   substance made up of only one type of atom  
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atom   smallest unit of an element (smallest unit to maintain the properties of that element)  
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proton   sub atomic particle with a positive charge  
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neutron   sub atomic particle with a negative charge  
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electron   sub atomic particle with no electircal charge  
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atomic number   number of protons in an atom (used to identify the element)  
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atomic weight   number of protons plus number of neutrons  
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bond   the connection between atoms in a molecule  
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energy levels   orbitals of electrons around neucleous  
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ionic bond   bond that is formed by the loss of one or more electrons by one atom and the gain of electrons by another  
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valence   electrical charge  
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ion   an atom involved in a ionic bond  
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salt   a molecule made of ions other than OH- and H+  
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cations   ions with a positive sharge  
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anions   ions with a negative charge  
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aqueous solution   water solvent  
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ionize (dissociation)   chemical reaction resulting in ions  
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synthesis   chemical reaction resulting in combining ions  
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covalent bonds   bond that shares electrons between two atoms  
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disulfide bonds   covalent bond between two atoms of sulfur  
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hydrogen bond   the attraction between the proton of an atom with a covalent hydrogen with slightly negative atoms  
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water composition in the body   60 %to 75%  
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solvent   liquid that is capable of disolving  
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solutes   substance capable of being dissolved  
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intracellular fluid (ICF)   water within cells  
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extracellular fluid (ECF)   water surrounding cells  
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plasma   water found in blood vessels ECF  
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lymph   water found in lymphatic vessels ECF  
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interstitial fluid   water found in small spaces between cells ECF  
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specialized fluid   examples- synovial fluid, cerebrospinal fluid, aqueous humor, etc. ECF  
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acidosis   accumulation of carbon dioxide in the blood  
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cell respiration   chemical reaction responsible for energy production in cells  
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trace elements   elements that are needed by the body in small amounts  
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acid   substance that increases the concentration of H+  
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base   substance that decreases the concentration of H+  
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pH   parts hydrogen, scale for measuring H+ content  
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buffer system   chemical(s) that minimize changes in pH by reacting with strong acids of strong bases  
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carbohydrates   sugars that act as a source of energy  
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monosaccharides   single sugar  
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hexose   six carbon sugar ex. glucose  
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pentose   five carbon sugar, not used for energy but are a part of nucleic acids  
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disaccharides   double sugars made of made of two monosaccharides linked by covalent bonds  
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oligosaccharides   consists of from 3 to 20 monosaccharides found on outer surfaces of cells and act as antigens  
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polysaccharides   thousands of glucose molecules bonded in different ways  
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starches   branched chaines of glucose produced by plant cells to store energy  
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glycogen   highly branched chain of glucose used for storing unneeded glucose kept in liver and skeletal muscles  
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cellulose   a nearly straight chain of glucose molecules produced by plant cells as part of thier cell walls, undigestibe by humans, aids in digestion  
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fiber   another term for cellulose  
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peristalsis   the muscle contraction of the large intestine that propels waste from the body  
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lipids   organic compounds containing carbon, hydrogen, oxygen, and sometimes phosphorus  
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true fats   one molecule of glycerol and one, two, or three fatty acid molecules  
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triglyceride   three fatty acid molecules and bonded to a single glycerol  
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phospholipid   diglyceride with a phosphate group  
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lecithin   a phospholipid that is part of cell membranes  
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myelin   phospholipid that forms the sheath surrounding nerve cells  
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steroids   a type of lipid  
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cholesterol   a steroid that is made of four rings fo carbon and hydrogen, produced in liver and used is used in cell membranes  
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proteins   made of amino acids  
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amino acids   building blocks of proteins made of carbon, hydrogen, oxygen, and nitrogen and sometimes sulfur  
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peptide bond   a bond between two amino acids  
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polypeptide   short chain of amino acids linked by peptide bonds  
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enzymes   a catalyst for reactions in the body  
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catalysts   speed up chemical reactions without the need for an external source fo energy  
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active site theory   theory that explaines how enzymes and the molecules interact based on shapes of attachment sites  
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substrates   molecules involved in a reaction catalyzed by enzymes  
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dentured   enzyme that has lost its shape and is no longer useful as a catalyst  
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DNA   double helix of nucleotids that store our genetic code makes up the chromosomes in the nucleous of a cell  
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nucleotide   a pentose sugar, phosphate froup and one of several nitrogenous bases  
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ATP   a nucleotide formed in cell respiraiton, body's primary energy transport  
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