n. groups or islands of cells in the pancreas (*) islet of Langerhans (*) base (*) ossification (*) tympanic cavity

n. unreactive metallic element with chemical symbol Cu that is essential for red blood cell formation (*) leukemia (*) copper (*) respiratory system (*) polymer

n. molecule differing only in the spatial arrangement around a single carbon atom (*) umbilical cord (*) epimer (*) mitral valve (*) creatine

n. element which is present in very small amounts in living things (*) function (*) oviduct (*) trace element (*) isotope scan

n. atom, radical, or group replaced for another in a chemical molecule (*) alcohol (*) alcoholism (*) trachea (*) substituent

n. muscle that produces slow, long-term contractions; found in hollow organs (*) urine (*) smooth muscle (*) variant (*) biceps

n. a gland that secretes the substances it makes outside of the body (*) insecticide (*) hypothesis (*) exocrine gland (*) valence electrons

n. poisonous substance (*) embryonic membrane (*) trophoblast (*) toxin (*) vapor

n. the beginning (*) pupil (*) onset (*) essential fatty acid (*) cytoplasm

n. a substance that induces a reaction or effect (*) convulsions (*) gastric gland (*) agent (*) autoradiography