lower respiratory tract

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Related to lower respiratory tract: Lower respiratory tract infection

lower respiratory tract

one of the two divisions of the respiratory system. The lower respiratory tract includes the left and right bronchi and the alveoli where the exchange of oxygen and carbon dioxide occurs during the respiratory cycle. The bronchi divide into smaller bronchioles in the lungs, the bronchioles into alveolar ducts, the ducts into alveolar sacs, and the sacs into alveoli. The alveolar sacs and the alveoli present a total lung surface of about 850 square feet (79 square meters) for the exchange of oxygen and carbon dioxide, which occurs between the most internal alveolar surface and the tiny capillaries surrounding the external alveolar wall. The lower respiratory tract is a continuation of the upper respiratory tract and is a common site of infections, obstructive conditions, and neoplastic disease. Compare upper respiratory tract. See also lung.


closer to ground surface.

lower airway
the trachea from the entrance to the thorax, bronchi and bronchioles.
lower burner syndrome
acupuncture term meaning chronic accumulation of fluid in the lungs because of failure of the kidneys to excrete the fluid.
lower motor neuron (LMN)
the final common nervous path; the ventral horn cell in the spinal cord and the peripheral motor neuron. A lesion of a sufficient number of these neurons causes atrophy of the muscles supplied by the nerve, weak reflexes and flaccid paralysis.
lower nephron nephrosis
see renal cortical necrosis.
lower respiratory tract
the trachea, bronchial tree, lungs, pulmonary vessels and pleura.
lower urinary tract
includes, ureters, bladder and urethra.
References in periodicals archive ?
According to 2003 data of Ministry of Health in Turkey; lower respiratory tract infections are responsible for deaths between 0-4 years at a rate of over 40%.
Hence, to know the necessity of vitamin A supplementation to children during Acute Gastroenteritis and Lower Respiratory Tract Infections.
MEDI8897 is being developed for the passive immunisation of all infants, term and preterm, as part of the firm's aim to increase the number of infants who are protected from lower respiratory tract illness caused by respiratory syncytial virus.
Lower respiratory tract infections were the most commonly listed diagnoses (59%), followed by diagnoses including kidney, urinary tract, and bladder infections (8%), upper respiratory tract infections (7%), and septicemia (7%).
Down syndrome alone is a risk factor for severe respiratory syncytial virus infections of the lower respiratory tract and may merit an indication for prophylaxis with palivizumab, according to Dr.
The median diameters at which particles exhibit aerosol behavior also correspond to the sizes at which they are efficiently deposited in the lower respiratory tract when inhaled.
The most common sites of major infections were the lower respiratory tract (accounting for 33%), systemic infections (19%), and the gastrointestinal tract (12%), according to Dr.
Suda and her associates broke down the types of infection into four main types: urinary tract, skin and soft tissue, upper respiratory tract, and lower respiratory tract.
Epithelial cells of both the upper and lower respiratory tract seem to be similarly affected, indicating a systemic effect.
It manifests clinically either in the upper respiratory tract (usually in the supraglottic larynx) or in the lower respiratory tract (usually with tracheobronchial involvement).

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