{oculomotor nerve}{}{Cranial nerve III; motor fibers transmit impulses to muscles of the eyes, sensory fibers transmit impulses from muscles of eyes.}
{olfactory bulb}{}{Ganglionlike enlargement at the rostral end of the olfactory tract that lies over the cribriform plate; receives the olfactory nerves from the nasal cavity.}
{olfactory cell}{}{Sensory cells pertaining to the sense of smell.}
{olfactory cortex}{}{Termination of the olfactory tract in the cerebral cortex within the lateral fissure of the cerebrum.}
{olfactory nerve}{}{First pair of cranial nerves, which conduct impulses associated with sense of smell.}
{olfactory receptor}{}{Sensory cells pertaining to the sense of smell.}
{oocyte}{}{Immature egg cell.}
{optic nerve}{}{Nerve carrying visual signals from the eye to the optic chiasm.}
{orbital}{}{Path of an electron around the nucleus of an atom.}
{organ}{}{Structure consisting of a group of tissues with a specialized function.}
{organ system}{}{Group of organs functionally and/or anatomically united to perform a specific role in the body.}
{organelle}{}{Specialized part of a cell serving one or more specific individual functions.}
{organic molecule}{}{Carbon-containing molecule.}
{organism}{}{Individual living thing.}
{origin}{}{Less movable attachment point of a muscle; usually the medial or proximal end of a muscle associated with the limbs.}
{oropharynx}{}{Portion of the pharynx in the posterior of the oral cavity.}
{oscillating circuit}{}{Neuronal circuit arranged in a circular fashion that allows action potentials produced in the circuit to keep stimulating the neurons of the circuit.}
{osmosis}{}{Diffusion of solvent [water] through a membrane from a less concentrated solution to a more concentrated solution.}
{ossification}{}{Bone formation.}
{osteoblast}{}{Bone-forming cell.}
{osteoclast}{}{Large multinucleated cell that absorbs bone.}
{osteocyte}{}{Mature bone cell surrounded by bone matrix.}
{osteon}{}{A central canal containing blood capillaries and the concentric lamellae around it; occurs in compact bone.}
{ovary}{}{Primary female reproductive organ; an egg cell-producing organ.}
{oviduct}{}{Tube that leads from ovary to uterus; uterine tube or fallopian tube.}
{ovum [ova]}{}{Egg cell.}
{oxidation}{}{Loss of one or more electrons from a molecule.}
{oxygen}{}{Important atom required in aerobic respiration; aerobic organisms cannot live without it.}
