Medical research

Using nanocapsules to deliver vaccines to lungs

Many viruses and bacteria infect humans through mucosal surfaces, such as those in the lungs, gastrointestinal tract and reproductive tract. To help fight these pathogens, scientists are working on vaccines that can establish ...

Diseases, Conditions, Syndromes

Respiratory microbiome may influence your susceptibility to flu

Specific respiratory microbiome communities may be linked to influenza susceptibility, according to a study published January 9, 2019 in the open-access journal PLOS ONE by Betsy Foxman from the University of Michigan, USA, ...

Medical research

Genetic lung disease's molecular roots identified

Respiratory infections peak during the winter months, and most people recover within a few weeks. But for those with a rare genetic lung disease, the sniffling, coughing and congestion never end. The tiny hairlike structures ...

Diseases, Conditions, Syndromes

Leprosy's drug resistance and origin revealed by genome analysis

Leprosy is an infectious disease with gruesome symptoms. It damages the skin, peripheral nerves, the upper respiratory tract, and the eyes. Despite being curable with multidrug therapy, leprosy still persists in many developing ...

Inflammatory disorders

Asthma researchers test substance from coralberry leaves

The coralberry could offer new hope for asthmatics. Researchers at the University of Bonn have extracted an active pharmaceutical ingredient from its leaves to combat asthma, a widespread respiratory disease. In mice, it ...

Immunology

Resveratrol can help to reduce inflammation, study finds

A component of red wine and grapes can help control inflammation induced by a bacterial pathogen that is linked to upper respiratory tract inflammatory diseases such as asthma, chronic obstructive pulmonary diseases (COPD) ...

Diseases, Conditions, Syndromes

Texas engineers develop potential treatment for whooping cough

A team of researchers from The University of Texas at Austin and Synthetic Biologics Inc. have developed two antibodies to potentially treat or prevent pertussis, the highly contagious respiratory tract infection that affects ...

Diseases, Conditions, Syndromes

Scarlet fever making a comeback

An international study led by University of Queensland (UQ) researchers has tracked the re-emergence of a childhood disease which had largely disappeared over the past 100 years.

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Respiratory tract

In humans the respiratory tract is the part of the anatomy that has to do with the process of respiration.

The respiratory tract is divided into 3 segments:

The respiratory tract is a common site for infections. Upper respiratory tract infections are probably the most common infections in the world.

Most of the respiratory tract exists merely as a piping system for air to travel in the lungs; alveoli are the only part of the lung that exchanges oxygen and carbon dioxide with the blood.

Moving down the respiratory tract starting at the trachea, the tubes get smaller and divide more and more. There are estimated to be about 20 to 23 divisions, ending up at an alveolus.

Even though the cross-sectional area of each bronchus or bronchiole is smaller, because there are so many, the total surface area is larger. This means there is less resistance at the terminal bronchioles. (Most resistance is around the 3-4 division from the trachea due to turbulence.)

This text uses material from Wikipedia, licensed under CC BY-SA