Oedemaexcessive accumulation of fluid in the tissues or body cavities; often results in swelling of the area |
Oestrogenfemale sex hormone secreted by the ovary |
Olfactionscientific name for the sensation of smell |
Oliguriareduced urine output |
Omnivoreanimal that eats both plants and meat |
Organa group of tissues that perform a particular function |
Organic substancea substance that is derived from a living organism or contains hydrocarbon groups, for example fats and carbohydrates |
Orthopnoeabreathing in an upright position, usually standing; the elbows are abducted to minimise compression of the chest wall |
Osmoregulationthe maintenance of optimal osmotic pressure by controlling water and salt content of body fluids |
Osmosisthe movement of water from an area of low concentration to one of high concentration through a semipermeable membrane, in order to equalise the concentrations on each side of the membrane |
Osmotic pressurethe pressure needed to prevent osmosis from occurring; depends on the number of particles in a solution |
Osteoblastbone-forming cell |
Osteoclastcell that breaks down bone |
Osteocytebone cell |
Ototoxicitytoxic to the ear, specifically the vestibulcochlear system (inner ear) |
Outbreedingbreeding from two animals that are not related |
Oxidation1. reaction in which oxygen molecules are added to a chemical substance. 2. loss of electrons. |