
The respiratory system (or ventilatory system) is a biological system consisting of specific organs and structures used for the process of respiration in an organism. The respiratory system is involved in the intake and exchange of oxygen and carbon dioxide between an organism and the environment. In air-breathing vertebrates like human beings, re...
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http://en.wikipedia.org/wiki/Respiratory_system

(from the article `respiration`) the process by which animal organisms take up oxygen and discharge carbon dioxide in order to satisfy their energy requirements. In the living ... While the solubility of oxygen in blood plasma is adequate to supply the tissues of some relatively sedentary invertebrates, more active animals with ... T...
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http://www.britannica.com/eb/a-z/r/37

The organs that are involved in breathing. These include the nose, throat, larynx, trachea, bronchi, and lungs. Also called respiratory tract.
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http://www.cancer.gov/dictionary?expand=R

Figure A shows the location of the respiratory structures in the body. Figure B is an enlarged image of airways, alveoli, and the capillaries. Figure C shows the location of gas exchange between the capillaries and alveoli. The respiratory system is a group of organs responsible for carrying oxy...
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http://www.daviddarling.info/encyclopedia/R/respiratory_system.html

The organs that are involved in breathing. These include the nose, throat, larynx, trachea, bronchi, and lungs. ... (12 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973

the specialized organs whose job is to transfer oxygen from the air to the blood and carbon dioxide from the blood to the air. The organs of the system include the nose, the pharynx, the larynx, the trachea, the bronchi, and the lungs. Respiratory system.
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Generally refers to the nose, nasal passages and lungs.
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http://www.encyclo.co.uk/local/21516

Type: Term Definitions: 1. all the air passages from the nose to the pulmonary alveoli. Synonyms: systema respiratorium, apparatus respiratorius, respiratory apparatus
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http://www.medilexicon.com/medicaldictionary.php?t=89356

Respiratory system: The organs that are involved in breathing. These include the nose, throat, larynx, trachea, bronchi, and lungs.
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http://www.medterms.com/script/main/art.asp?articlekey=5332

The respiratory system is responsible for supplying oxygen to the blood and expelling waste gases, of which carbon dioxide is the primary constituent, from the body. The upper structures of the respiratory system are combined with the sensory organs of smell and taste (in the nasal cavity and the mouth) and the digestive system (from the oral cavit...
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http://www.probertencyclopaedia.com/browse/ER.HTM

[
n] - the system for taking in oxygen and giving off carbon dioxide
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http://www.webdictionary.co.uk/definition.php?query=respiratory%20system

The body system for breathing. Includes the nose, windpipe (trachea), airways and lungs.
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https://www.encyclo.co.uk/local/20753

the organs that carry out the process of respiration
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https://www.encyclo.co.uk/local/20875
systema respiratorium noun the system for taking in oxygen and giving off carbon dioxide; in terrestrial animals this is accomplished by breathing
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The respiratory system is the group of organs responsible for carrying oxygen from the air to the bloodstream and for expelling the waste product carbon dioxide.
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https://www.encyclo.co.uk/local/23035

the group of organs responsible for carrying oxygen from the air to the bloodstream and for expelling carbon dioxide.
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https://www.stanfordchildrens.org/en/topic/default?id=glossary---allergy-as

the system for taking in oxygen and giving off carbon dioxide; in terrestrial animals this is accomplished by breathing
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https://www.vocabulary.com/lists/56018
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