idiotype (id'e-o-tlp') The parts of an antibody's antigen binding site that are complementary in conformation to a particular antigen. p. 666 ileocecal sphincter (il"e-o-se'kal sfingk'ter) Ring of muscle fibers located at the distal end of the ileum where it joins the cecum. p. 723 ileum (il'e-um) Portion of the small intestine between the jejunum and the cecum. p. 717 iliac region (il'e-ak re'jun) Portion of the abdomen on either side of the lower middle, or hypogastric, region. p. 22

ilium (il'e-um) One of the bones of a coxal bone or hipbone. p. 239 immunity (i-mu'ni-te) Resistance to the effects of specific disease-causing agents. p. 661 immunoglobulin (im"u-no-glob'u-lin)

Globular plasma proteins that function as antibodies. p. 665 immunosuppressive drugs (im"u-no-sil-pres'iv drugz) Substances that suppress the immune response against transplanted tissue. p. 673 implantation (im"plan-ta'shun) The embedding of a cleavage embryo in the lining of the uterus. p. 943 impulse (im'puls) A wave of depolarization conducted along a nerve fiber or muscle fiber. p. 376 incisor (in-si'zor) One of the front teeth that is adapted for cutting food. p. 693 inclusion (in-kloo'zhun) A mass of lifeless chemical substance within the cytoplasm of a cell. p. 80 incomplete dominance (in"kom-plet' do'meh-nents) A heterozygote whose phenotype is intermediate between the phenotypes of the two homozygotes. p. 985 incompletely penetrant (in"kom-plet'le pen'e-trent) When the frequency of genotype expression is less than 100%. p. 986 incomplete protein (in"kom-plet' pro'ten) A protein that lacks adequate amounts of essential amino acids. p. 743 infection (in-fek'shun) The invasion and multiplication of microorganisms in body tissues. p. 659 inferior (in-fer'e-or) Situated below something else; pertaining to the lower surface of a part. p. 22 inflammation (in"flah-ma'shun) A tissue response to stress that is characterized by dilation of blood vessels and an accumulation of fluid in the affected region. p. 660 infrared ray (in"frah-red' ra) A form of radiation energy, with wavelengths longer than visible light, by which heat moves from warmer surfaces to cooler surroundings. p. 182 infundibulum (in"fun-dib'u-lum) The stalk attaching the pituitary gland to the base of the brain. p. 421 ingestion (in-jes'chun) The taking of food or liquid into the body by way of the mouth. p. 4

inguinal (ing'gwi-nal) Pertaining to the groin region. p. 24 inguinal canal (ing'gwi-nal kah-nal') Passage in the lower abdominal wall through which a testis descends into the scrotum. p. 881 inhibin (in'hib'in) A hormone secreted by cells of the testes and ovaries that inhibits the secretion of FSH from the anterior pituitary gland. p. 897 inorganic (in"or-gan'ik) Chemical substances that lack carbon and hydrogen. p. 49 insertion (in-ser'shun) The end of a muscle attached to a movable part. p. 318

inspiration (in"spi-ra'shun) Breathing in;

inhalation. p. 792 insula (in'su-lah) A cerebral lobe located deep within the lateral sulcus. p. 413 insulin (in'su-lin) A hormone secreted by the pancreatic islets of Langerhans that controls carbohydrate metabolism. p. 531 integumentary (in-teg-u-men'tar-e)

Pertaining to the skin and its accessory organs. p. 169 intercalated disk (in-ter"kah-lat'ed disk) Membranous boundary between adjacent cardiac muscle cells. p. 161 intercellular (in"ter-sel'u-lar) Between cells. p. 70

intercellular fluid (in"ter-sel'u-lar floo'id) Tissue fluid located between cells other than blood cells. p. 650 intercellular junction (in"ter-sel'u-lar junk'shun) Site of union between cells. p. 70

interferon (in"ter-fer'on) A class of immune system chemicals (cytokines) that inhibit multiplication of viruses and growth of tumors. p. 660 interleukin (in"ter-lu'kin) A class of immune system chemicals (cytokines) with varied effects on the body. p. 664 internal environment (in-ter'nal en-vi'ron-ment) Conditions and elements that make up the inside of the body. p. 6 interneuron (in"ter-nu'ron) A neuron located between a sensory neuron and a motor neuron; intercalated; internuncial, or association neuron. p. 370 interphase (in'ter-faz) Period between two cell divisions when a cell is carrying on its normal functions and prepares for division. p. 94

interstitial cell (in"ter-stish'al sel) A

hormone-secreting cell located between the seminiferous tubules of the testis. p. 883 interstitial fluid (in"ter-stish'al floo'id)

Same as intercellular fluid. p. 650 intervertebral disk (in"ter-ver'tei-bral disk) A layer of fibrocartilage located between the bodies of adjacent vertebrae. p. 211 intestinal gland (in-tes'tii-nal gland) Tubular gland located at the base of a villus within the intestinal wall. p. 718 intestinal juice (in-tes'ti-nal joos) The secretion of the intestinal glands. p. 718 intracellular (in"trah-sel'u-lar) Within cells. p. 857

intracellular fluid (in"trah-sel'u-lar floo'id) Fluid within cells. p. 857 intramembranous bone (in"trah-mem'brah-nus bon) Bone that forms from membranelike layers of primitive connective tissue. p. 200 intrauterine device (in"trah-u'ter-in de-vis) A solid object placed in the uterine cavity for purposes of contraception; IUD. p. 929

intrinsic factor (in-trin'sik fak'tor) A

substance produced by the gastric glands that promotes absorption of vitamin B12. p. 755

inversion (in-ver'zhun) Movement in which the sole of the foot is turned inward. p. 276 involuntary (in-vol'un-tair"e) Not consciously controlled; functions automatically. p. 160

iodopsin (i"o-dop'sin) A light-sensitive pigment within the cones of the retina. p. 494

ion (i'on) An atom or molecule with an electrical charge. p. 44 ionic bond (i-on'ik bond) A chemical bond formed by the transfer of electrons from one atom to another. p. 44 ipsilateral (ip"sii-lat'er-al) On the same side. p. 21

iris (i'ris) Colored muscular portion of the eye that surrounds the pupil and regulates its size. p. 486 ischemia (is-ke'me-ah) A deficiency of blood in a body part. p. 597 isometric contraction (i"so-met'rik kon-

trak'shun) Muscular contraction in which the muscle does not shorten. p. 313 isotonic contraction (i"so-ton'ik kon-

trak'shun) Muscular contraction in which the muscle shortens. p. 313 isotonic (i"so-ton'ik) Condition in which a solution has the same concentration of dissolved particles as the solution with which it is compared. p. 87 isotope (i'so-toip) An atom that has the same number of protons as other atoms of an element but has a different number of neutrons in its nucleus. p. 40 IUD An intrauterine device. p. 929

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