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respiratory acidosis
respiratory alkalosis
respiratory center
respiratory disease
respiratory disorder
respiratory distress syndrome
respiratory distress syndrome of the newborn
Respiratory foods
respiratory illness
respiratory infection
respiratory organ
respiratory pigment
respiratory quotient
respiratory rate
respiratory syncytial virus
respiratory therapy
respiratory tract
respiratory tract infection
Respiratory tree
respite care

respiratory system definitions

WordNet (r) 3.0 (2005)

1: the system for taking in oxygen and giving off carbon dioxide; in terrestrial animals this is accomplished by breathing [syn: respiratory system, systema respiratorium]

Merriam Webster's

noun Date: 1888 a system of organs functioning in respiration and in humans consisting especially of the nose, nasal passages, pharynx, larynx, trachea, bronchi, and lungs

Britannica Concise

Organ system involved in respiration. In humans, the diaphragm and, to a lesser extent, the muscles between the ribs generate a pumping action, moving air in and out of the lungs through a system of pipes (conducting airways), divided into upper and lower airway systems. The upper airway system comprises the nasal cavity (see nose), sinuses, and pharynx; the lower airway system consists of the larynx, trachea, bronchi, bronchioles, and alveolar ducts (see pulmonary alveolus). The blood and cardiovascular system can be considered elements of a working respiratory system. See also thoracic cavity.

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