Trachea: In insects and spiders, a series of tubes that carry air directly to cells for gas exchange; in humans, the air-conducting duct that leads from the pharynx to the lungs.

 

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Trachea: In insects and spiders, a series of tubes that carry air directly to cells for gas exchange; in humans, the air-conducting duct that leads from the pharynx to the lungs.

Croup. Any Obstructive Condition Of The Larynx (Voice Box) Or Trachea (Windpipe), Characterized By A Hoarse, Barking Cough And Difficult Breathing Occurring Chiefly In Infants And Children. In The Early-Nineteenth Century It Was Called Cynanche Trachealis: roup, hives, choak, stuffing, rising of the lights.

Tracheae: The air tubes in insects: in spiders, tubular respiratory organs of different origin: by many thought to be modified book lungs.

Hives: A skin eruption of smooth, slightly elevated areas on the skin which is redder or paler than the surrounding skin. Often attended by severe itching. Also called cynanche trachealis. In the m . . . View Full Definition

Spiracle: The opening of the tracheae on the underside of the abdomen.

Heart: The multicellular, chambered, muscular structure that pumps blood through the circulatory system by alternately contracting and relaxing.

Epiglottis: A fiap of tissue that closes off the trachea during swallowing.

Larynx: A hollow structure at the beginning of the trachea. The vocal cords extend across the opening of the larynx.

Pharynx: The passageway between the mouth and the esophagus and trachea. Food passes from the pharynx to the esophagus, and air passes from the pharynx to the trachea.

Bronchi: Tubes that carry air from the trachea to the lungs (sing.: bronchus).