labor (la'bor) The process of childbirth. p. 918
labyrinth (lab'i-rinth) The system of connecting tubes within the inner ear, including the cochlea, vestibule, and semicircular canals. p. 471 lacrimal gland (lak'rii-mal gland) Tear-
secreting gland. p. 481 lactase (lak'tais) Enzyme that catalyzes breakdown of lactose into glucose and galactose. p. 719 lactate (lak'tait) Lactic acid. p. 309 lactation (lak-ta'shun) Production of milk by the mammary glands. p. 922 lacteal (lak'te-al) A lymphatic capillary associated with a villus of the small intestine. p. 718 lactic acid (lak'tik as'id) An organic compound formed from pyruvic acid during anaerobic respiration. p. 309 lactose (lak'tois) A disaccharide in milk; milk sugar. p. 50 lacuna (lah-ku'nah) A hollow cavity. p. 158 lamella (lah-mel'ah) A layer of matrix in bone tissue. p. 158 large intestine (lahrj in-tes'tin) The part of the gastrointestinal tract extending from the ileum to the anus; divided into the cecum, colon, rectum, and anal canal. p. 723
laryngopharynx (lah-ring"go-far'ingks) The lower portion of the pharynx near the opening to the larynx. p. 695 larynx (lar'ingks) Structure located between the pharynx and trachea that houses the vocal cords. p. 782 latent period (la'tent pe're-od) Time between the application of a stimulus and the beginning of a response in a muscle fiber. p. 311
lateral (lat'er-al) Pertaining to the side. p. 21 leukocyte (lu'ko-siit) A white blood cell. p. 553
leukocytosis (lu"ko-si-to'sis) Too many white blood cells. p. 557 leukopenia (lu"ko-pe'ne-ah) Too few leukocytes in the blood. p. 557 lever (lev'er) A simple mechanical device consisting of a rod, fulcrum, weight, and a source of energy that is applied to some point on the rod. p. 205 ligament (lig'ah-ment) A cord or sheet of connective tissue binding two or more bones at a joint. p. 274 limbic system (lim'bik sis'tem) A group of connected structures within the brain that produces emotional feelings. p. 422 linea alba (lin'e-ah al'bah) A narrow band of tendinous connective tissue in the midline of the anterior abdominal wall. p. 335 lingual (ling'gwal) Pertaining to the tongue. p. 691
lipase (lI'pas) A fat-digesting enzyme. p. 707 lipid (lip'id) A fat, oil, or fatlike compound that usually has fatty acids in its molecular structure. p. 50 lipoprotein (lip"o-pro'te-in) A complex of lipid and protein. p. 562 liver (liv'er) A large, dark red organ in the upper part of the abdomen on the right side that detoxifies blood, stores glycogen and fat-soluble vitamins, and synthesizes proteins. p. 709 lobule (lob'ul) A small, well-defined portion of an organ. p. 791 lower esophageal sphincter (loh'er e-sof"ah-je'al sfingk'ter) Ring of muscles located at the distal end of the esophagus where it joins the stomach, p. 700 lower limb (loh'er lim) Inferior appendage consisting of the thigh, leg, ankle, and foot. p. 212
lumbar (lum'bar) Pertaining to the region of the loins, part of back between the thorax and pelvis. p. 24 lumen (lu'men) Space within a tubular structure such as a blood vessel or intestine. p. 718 luteinizing hormone (lu'te-in-Iz"ing hor'mon) A hormone secreted by the anterior pituitary gland that controls the formation of the corpus luteum in females and the secretion of testosterone in males; LH (ICSH in males). p. 518 lymph (limf) Fluid transported by the lymphatic vessels. p. 650 lymph node (limf noId) A mass of lymphoid tissue located along the course of a lymphatic vessel. p. 650 lymphocyte (lim'fo-sIt) A type of white blood cell that provides immunity. p. 556 lysosome (li'so-soIm) Organelle that contains enzymes that degrade worn cell parts. p. 77
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