respiratory system


respiratory system

noun

Definition of RESPIRATORY SYSTEM

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

Illustration of RESPIRATORY SYSTEM

First Known Use of RESPIRATORY SYSTEM

1888

respiratory system

noun    (Medical Dictionary)

Medical Definition of RESPIRATORY SYSTEM

: a system of organs functioning in respiration and consisting especially of the nose, nasal passages, nasopharynx, larynx, trachea, bronchi, and lungs—called also respiratory tract; see lower respiratory tract, upper respiratory tract

Illustration of RESPIRATORY SYSTEM

respiratory system

noun    (Concise Encyclopedia)

As air enters the nasal cavity through the nostrils, it is warmed and moistened by mucous membranes …—© Merriam-Webster Inc.

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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