| RI | radiation intensity; radioactive isotope; radioimmunology; recession index; recombinant inbred [stra... |
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| RR | radiation reaction; radiation response; rate ratio; rational recovery [group]; recovery room; relati... |
| URD | unspecified respiratory disease; upper respiratory disease |
| URI | uniform resource identifier; upper respiratory illness; upper respiratory infection |
| ACE | Angiotensin Converting Enzyme = Kininase II = Dipeptidyl Carboxypepti... |
| respiratory enteric orphan virus | A nonenveloped icosahedral virus whose genome consists of double stranded RNA, belonging to the family Reoviridae, frequently found in both the respiratory and enteric tract. Synonym: REO virus. (05 Mar 2000) |
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| respiratory epithelium | The pseudostratified ciliated epithelium that lines the conducting portion of the airway, including part of the nasal cavity and larynx, the trachea, and bronchi. (05 Mar 2000) |
| respiratory exchange ratio | The ratio of the net output of carbon dioxide to the simultaneous net uptake of oxygen at a given site, both expressed as moles or STPD volumes per unit time; in the steady state, respiratory exchange ratio is equal to the respiratory quotient of metabolic processes. (05 Mar 2000) |
| respiratory failure | A clinical syndrome that is defined either by the inability to rid the body of C02 or establish an adequate blood oxygen level (PAO2). See: arterial blood gas. (27 Sep 1997) |
| respiratory frequency | The number of breaths per minute. (05 Mar 2000) |
| respiratory function tests | Measurement of the various processes involved in the act of respiration: inspiration, expiration, oxygen and carbon dioxide exchange, lung volume and compliance, etc. (12 Dec 1998) |
| respiratory hypersensitivity | A form of hypersensitivity affecting the respiratory tract. It includes asthma and hay fever. (12 Dec 1998) |
| respiratory inhibitor | A compound that inhibits the respiratory chain. Synonym: respiratory poison. (05 Mar 2000) |
| respiratory insufficiency | Failure to adequately provide oxygen to cells of the body and to remove excess carbon dioxide from them. (12 Dec 1998) |
| respiratory lobule | The part of the airway consisting of a respiratory bronchiole and all of its branches. Synonym: primary pulmonary lobule, respiratory lobule. (05 Mar 2000) |
| respiratory mechanics | The physical or mechanical action of the lungs, diaphragm, ribs, and chest wall during respiration. It includes airflow, lung volume, neural and reflex controls, mechanoreceptors, breathing patterns, etc. (12 Dec 1998) |
| respiratory metabolism | The exchange of respiratory gases in the lungs, oxidation of foodstuffs in the tissues, and production of carbon dioxide and water. (05 Mar 2000) |
| respiratory metal | A metal present in certain respiratory pigments; e.g., iron, manganese, copper, vanadium. (05 Mar 2000) |
| respiratory minute volume | The minute volume of breathing; the product of tidal volume times the respiratory frequency. See: pulmonary ventilation. (05 Mar 2000) |
| respiratory mucosa | Pseudostratified ciliated columnar epithelium with goblet cells and a lamina propria containing, in addition to connective tissue, numerous seromucous glands and in some regions many thin-walled veins which line the airways. See: region of respiratory mucosa. (05 Mar 2000) |