{gallbladder}{}{Saclike organ associated with liver that stores and concentrates bile.}

{ganglion [ganglia]}{}{Any group of nerve cell bodies in the peripheral nervous system.}

{gap junction}{}{Small channel between cells that allows the passage of ions and small molecules between cells; provides means of intercellular communication.}

{gastric juice}{}{Secretion of gastric glands within stomach.}

{gastrula}{}{Stage of embryonic development in which the blastula has invaginated to form an archenteron.}

{gene}{}{Functional unit of heredity. Each gene occupies a specific place, or locus, on a chromosome, is capable of reproducing itself exactly at each cell division, and often is capable of directing the formation of an enzyme or other protein.}

{gestation period}{}{The length of time between fertilization of an ovum and parturition, or birth.}

{gland}{}{Secretory organ from which secretions may be released into the blood, a cavity, or onto a surface.}

{glandular epithelium}{}{Composed of cells specialized to secrete products.}

{glomerulus [glomeruli]}{}{Capillary tuft within glomerular capsule of nephron.}

{glossopharyngeal nerve}{}{Cranial nerve IX; sensory fibers transmit impulses from the pharynx, posterior tongue, and carotid arteries, motor fibers transmit impulses to muscles of the pharynx used in swallowing and to the salivary glands.}

{glucose}{}{Monosaccharide in blood that is the primary source of cellular energy.}

{glycolysis}{}{Anaerobic process during which glucose is converted to pyruvic acid; net of two ATP molecules is produced during glycolysis.}

{glycoprotein hormone}{}{A hormone composed of a carbohydrate combined with a protein.}

{Golgi apparatus}{}{Named for Camillo Golgi, Italian histologist and Nobel laureate, 1843–1926. Specialized endoplasmic reticulum that concentrates and packages materials for secretion from the cell.}

{Golgi tendon apparatus}{}{Proprioceptive nerve ending in a tendon.}

{gomphosis}{}{Fibrous joint in which a peglike process fits into a hole.}

{ground substance}{}{Portion of connective tissue matrix that can range from fluid to solid.}

{growth}{}{Process by which a structure enlarges.}

{guanine}{}{One of the four nucleotides found in DNA and RNA; abbreviated as "G."}

{gustatory stimulus}{}{Sensory impulse associated with the sense of taste.}

{gyrus [gyri]}{}{A fold located on the cerebrum of the brain.}