deamination (de-am"i-na'shun) Removing amino groups (NH2) from amino acids. p. 743

deciduous teeth (de-sid'u-us teth) Teeth that are shed and replaced by permanent teeth; primary teeth. p. 693 decomposition (de-kom"po-zish'un) The breakdown of molecules into simpler compounds. p. 45 deep (deep) Far beneath the surface. p. 22 defecation (def"e-ka'shun) The discharge of feces from the rectum through the anus. p. 726

dehydration (de"hi-dra'shun) Excessive water loss. p. 862 dehydration synthesis (de"hi-dra'shun sin'the-sis) Anabolic process that joins small molecules; synthesis. p. 110 dendrite (den'drlt) Nerve fiber that transmits impulses toward a neuron cell body. p. 319 densitometer (den"si-tom'e-ter) An instrument used to measure the density of bone tissue. p. 210 dental caries (den'tal kar'ez) Decalcification and decay of teeth. p. 696 dentin (den'tin) Bonelike substance that forms the bulk of a tooth. p. 693 deoxyhemoglobin (de-ok"si-he"mo-glo'bin) Hemoglobin to which oxygen is not bound. p. 548

deoxyribonucleic acid (de-ok'si-rl"bo-nu-kle"ik as'id) The genetic material; a double-stranded polymer of nucleotides, each containing a phosphate group, a nitrogenous base (adenine, thymine, guanine, or cytosine), and the sugar deoxyribose; DNA. p. 57 depolarization (de-po"lar-i-za'shun) The loss of an electrical charge on the surface of a membrane. p. 376 deposition (dep"o-zi'shun) The laying down of bony tissue. p. 203 depression (de-presh'un) Downward displacement. p. 278 dermatome (der'mah-tom) An area of the body supplied by sensory nerve fibers associated with a particular dorsal root of a spinal nerve. p. 432

dermis (der'mis) The thick layer of the skin beneath the epidermis. p. 170 descending colon (de-send'ing ko'lon) Portion of the large intestine that passes downward along the left side of the abdominal cavity to the brim of the pelvis. p. 723

descending tract (de-send'ing trakt) Group of nerve fibers that carries nerve impulses downward from the brain through the spinal cord. p. 404 desmosome (des'mo-som) A specialized junction between cells, which serves as a "spot weld." p. 70 detrusor muscle (de-truz'or mus'l) Muscular wall of the urinary bladder. p. 845 dextrose (dek'stros) Glucose. p. 50 diabetes insipidus (di"ah-be'tez in-sip'i-dus) Extremely copious urine produced due to a deficiency of antidiuretic hormone. p. 519 diabetes mellitus (di"ah-be'tez mel-li'tus) High blood glucose level and glucose in the urine due to a deficiency of insulin. p. 534 dialysis (di-al'i-sis) Separation of smaller molecules from larger ones in a liquid. p. 822

diapedesis (di"ah-pe-de'sis) Squeezing of leukocytes between the cells of blood vessel walls. p. 557 diaphragm (di'ah-fram) A sheetlike structure largely composed of skeletal muscle and connective tissue that separates the thoracic and abdominal cavities; also a caplike contraceptive device inserted in the vagina. p. 11 diaphysis (di-af'i-sis) The shaft of a long bone. p. 196 diastole (di-as'to-le) Phase of the cardiac cycle when a heart chamber wall relaxes. p. 591

diastolic pressure (di-a-stol'ik presh'ur)

Arterial blood pressure during the diastolic phase of the cardiac cycle. p. 609 diencephalon (di"en-sef'ah-lon) Portion of the brain in the region of the third ventricle that includes the thalamus and hypothalamus. p. 418 differentiation (dif'er-en"she-a'shun) Cell specialization. p. 97 diffusion (di-fu'zhun) Random movement of molecules from a region of higher concentration toward one of lower concentration. p. 82 digestion (di-jest'yun) Breaking down of large nutrient molecules into smaller molecules that can be absorbed; hydrolysis. p. 5

digital (di'ji-tal) Pertaining to the finger. p. 24

dihydrotestosterone (di-hi"dro-tes-tos'ter-on) Hormone produced from testosterone that stimulates certain cells of the male reproductive system. p. 897 dipeptide (di-pep'tld) A molecule composed of two joined amino acids. p. 54 diploid (dip'loid) Body cell with two full sets of chromosomes, in humans 46. p. 979

disaccharide (di-sak'ah-rld) A sugar produced by the union of two monosaccharides. p. 50 distal (dis'tal) Farther from the midline or origin; opposite of proximal. p. 21 diuretic (di"u-ret'ik) A substance that increases urine production. p. 518 divergence (di-ver'jens) A spreading apart. p. 385

DNA Deoxyribonucleic acid. p. 57 dominant allele (dom'i-nant ah-lel) The form of a gene that is expressed. p. 983 dorsal cavity (dor'sal kav'i-te) A hollow space in the posterior portion of the body containing the cranial cavity and vertebral canal. p. 10

dorsal root (dor'sal root) The sensory branch of a spinal nerve by which it joins the spinal cord. p. 432 dorsal root ganglion (dor'sal root gang'gle-on) Mass of sensory neuron cell bodies located in the dorsal root of a spinal nerve. p. 432 dorsiflexion (dor"si-flek'shun) Bending the foot upward. p. 276 dorsum (dor'sum) Pertaining to the back surface of a body part. p. 24 ductus arteriosus (duk'tus ar-te"re-o'sus) Blood vessel that connects the pulmonary artery and the aorta in a fetus. p. 961 ductus venosus (duk'tus ven-o'sus) Blood vessel that connects the umbilical vein and the inferior vena cava in a fetus. p. 961 duodenum (du"o-de'num) The first portion of the small intestine that leads from the stomach to the jejunum. p. 715 dural sinus (du'ral si'nus) Blood-filled channel formed by the splitting of the dura mater into two layers. p. 396 dura mater (du'rah ma'ter) Tough outer layer of the meninges. p. 396 dynamic equilibrium (di-nam'ik e"kwi-lib're-um) Maintenance of balance when the head and body are suddenly moved or rotated. p. 476 dystrophin (dis'tre-fin) A protein comprising only 0.002% of the total protein in skeletal muscle that supports the cell membrane. Its absence causes muscular dystrophy. p. 306

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